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==Definition==
 
==Definition==
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Guna is the inseparable concomitance (samavaya) with the substance but is devoid of any action (nishcheshta)[Cha.Sa.[[Sutra Sthana]] 1/51]. The action is always presented through medium of a substance (dravya).  
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Guna is the inseparable concomitance (samavaya) with the substance but is devoid of any action (nishcheshta).[Cha.Sa.[[Sutra Sthana]] 1/51] The action is always presented through medium of a substance (dravya).  
    
==Contextual meanings==
 
==Contextual meanings==
    
The word ‘guna’ is also implied to denote other contextual meanings like importance, good quality, advantage, multiplication (folds/times).
 
The word ‘guna’ is also implied to denote other contextual meanings like importance, good quality, advantage, multiplication (folds/times).
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==Types==
 
==Types==
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| | 1 ||Heavy (guru)|| [[Prithvi]],[[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces heaviness(gaurava), increases excreta (mala) and coats the body channels (srotas upalepa), nourishes and increases mass, density  || Nourishing therapy([[brimhana]]), Oleation therapy ([[snehana]]), Sudation therapy ([[swedana]]) ||Black gram (Masha) etc.  
 
| | 1 ||Heavy (guru)|| [[Prithvi]],[[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces heaviness(gaurava), increases excreta (mala) and coats the body channels (srotas upalepa), nourishes and increases mass, density  || Nourishing therapy([[brimhana]]), Oleation therapy ([[snehana]]), Sudation therapy ([[swedana]]) ||Black gram (Masha) etc.  
 
|-
 
|-
| | 2 || Light (laghu)|| [[Vayu]] , [[Akasha]] ,  [[Agni]] || Increases [[Vata]], Pacifies [[Kapha]] || Reduces weight and volume of (lekhana) excreta (mala), clears the channels of the body ([[srotas]]), enhances enthusiasm, weakens, wound healing  || Reducing therapy ([[langhana]]), Drying therapy ([[rukshana]]), Styptic therapy ([[stambhana]]), Scrapping therapy (lekhana), Scarification (vranalekhana) || Hot water, Green gram (Mudga)
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| | 2 || Light (laghu)|| [[Vayu]] , [[Akasha]] ,  [[Agni]] || Increases [[Vata]], Pacifies [[Kapha]] || Reduces weight and volume (lekhana) of excreta (mala), clears the channels of the body ([[srotas]]), enhances enthusiasm, weakens, wound healing  || Reducing therapy ([[langhana]]), Drying therapy ([[rukshana]]), Styptic therapy ([[stambhana]]), Scrapping therapy (lekhana), Scarification (vranalekhana) || Hot water, Green gram (Mudga)
 
|-
 
|-
 
| | 3 || Cold (hima/sheeta) || [[Jala]] || Increases [[Kapha]] and  [[Vata]], Pacifies [[Pitta]] || Styptic action ([[sthambhana]]) and produces pleasantness || Nourishing therapy ([[brimhana]]), Oleation ([[snehana]]), styptic therapy ([[stambhana]]); pacifies burning sensation (daha), giddiness (murchcha) and thirst(trit) || Chandana (Santalum album)
 
| | 3 || Cold (hima/sheeta) || [[Jala]] || Increases [[Kapha]] and  [[Vata]], Pacifies [[Pitta]] || Styptic action ([[sthambhana]]) and produces pleasantness || Nourishing therapy ([[brimhana]]), Oleation ([[snehana]]), styptic therapy ([[stambhana]]); pacifies burning sensation (daha), giddiness (murchcha) and thirst(trit) || Chandana (Santalum album)
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| | 8 || Sharp (tikshna) || [[Agni]] || Increases [[Pitta]], Pacifies [[Kapha]] || Responsible for quick and severe effect || Sudation therapy ([[swedana]]), reducing therapy ([[langhana]]), drying therapy ([[rukshana]])  || Bhallataka (Semecarpus anacardium), pepper   
 
| | 8 || Sharp (tikshna) || [[Agni]] || Increases [[Pitta]], Pacifies [[Kapha]] || Responsible for quick and severe effect || Sudation therapy ([[swedana]]), reducing therapy ([[langhana]]), drying therapy ([[rukshana]])  || Bhallataka (Semecarpus anacardium), pepper   
 
|-
 
|-
| | 9 || Stable or immobile (sthira) || [[Prithvi]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces firmness, stability || Nourishing therapy ([[brimhana]]), drying therapy ([[rukshana]]), styptic therapy ([[stambhana]]) || Bala (Sidacordifolia)
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| | 9 || Stable or immobile (sthira) || [[Prithvi]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces firmness, stability || Nourishing therapy ([[brimhana]]), drying therapy ([[rukshana]]), styptic therapy ([[stambhana]]) || Bala (Sida cordifolia)
 
|-
 
|-
 
| | 10 || Mobility (sara) || [[Vayu]]  || Increases [[Vata]], Pacifies [[Kapha]] || Responsible for fast spreading or initiates the movement || Sudation therapy ([[swedana]]), reducing therapy ([[langhana]]), oleation therapy ([[snehana]]) || Haritaki (Terminalia chebula)
 
| | 10 || Mobility (sara) || [[Vayu]]  || Increases [[Vata]], Pacifies [[Kapha]] || Responsible for fast spreading or initiates the movement || Sudation therapy ([[swedana]]), reducing therapy ([[langhana]]), oleation therapy ([[snehana]]) || Haritaki (Terminalia chebula)
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| | 12 || Hard (kathina) || [[Prithvi]]  || Increases [[Vata]], Pacifies [[Kapha]] || Produces hardness or rigidity || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]) || Bone, teeth, pravala
 
| | 12 || Hard (kathina) || [[Prithvi]]  || Increases [[Vata]], Pacifies [[Kapha]] || Produces hardness or rigidity || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]) || Bone, teeth, pravala
 
|-
 
|-
| | 13 ||  Non-slimy/clear (vishada)|| [[Prithvi]], [[Vayu]], [[Agni]], [[Akasha]]  || Increases [[Vata]], Pacifies [[Kapha]] || Reduces the moisture and cleans channels  || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]), Wound cleaning and healing || Nimba (Azadirachtaindica), alkali (kshara)
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| | 13 ||  Non-slimy/clear (vishada)|| [[Prithvi]], [[Vayu]], [[Agni]], [[Akasha]]  || Increases [[Vata]], Pacifies [[Kapha]] || Reduces the moisture and cleans channels  || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]), Wound cleaning and healing || Nimba (Azadirachta indica), alkali (kshara)
 
|-
 
|-
 
| | 14 || Slimy (pichchila) || [[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces stickiness or coating || Nourishing therapy ([[brimhana]]), Oleation therapy ([[snehana]]) || Isabgola
 
| | 14 || Slimy (pichchila) || [[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces stickiness or coating || Nourishing therapy ([[brimhana]]), Oleation therapy ([[snehana]]) || Isabgola
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| | 15 || Smooth (shlakshna) || [[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces soothing effect || Nourishing therapy ([[brimhana]]), styptic therapy ([[stambhana]]) || Ghee, Milk
 
| | 15 || Smooth (shlakshna) || [[Jala]] || Increases [[Kapha]], Pacifies [[Vata]] || Produces soothing effect || Nourishing therapy ([[brimhana]]), styptic therapy ([[stambhana]]) || Ghee, Milk
 
|-
 
|-
| | 16 || Coarse/Rough (khara) || [[Vayu]] || Increases [[Vata]], Pacifies [[Kapha]] || Produces scrapping effect || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]) || Honey, vacha ([[Acorus calamus]])
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| | 16 || Coarse/Rough (khara) || [[Vayu]] || Increases [[Vata]], Pacifies [[Kapha]] || Produces scrapping effect || Reducing therapy ([[langhana]]), drying therapy ([[rukshana]]) || Honey, vacha (Acorus calamus)
 
|-
 
|-
 
| | 17 || Gross (sthula) || [[Prithvi]]  || Increases [[Kapha]], Pacifies [[Vata]] || Produces bulkiness and cause obstruction in body channels || Nourishing therapy ([[brimhana]]), oleation therapy ([[snehana]]) || Curd
 
| | 17 || Gross (sthula) || [[Prithvi]]  || Increases [[Kapha]], Pacifies [[Vata]] || Produces bulkiness and cause obstruction in body channels || Nourishing therapy ([[brimhana]]), oleation therapy ([[snehana]]) || Curd
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|-
 
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Rough (karkasha) property is mentioned by Sushruta instead of coarse (khara). He added quickly acting(ashukari), pleasant odour (sugandha), foul smell (durgandha), pervading (vyavayi) and expanding by destroying body tissues (vikashi) in the list of properties[Su.Sa.Su. 46/515-524]. Dehydrated (shushka) property is added by Bhavamishra.<ref>P.V.Sharma, Dravyaguna-vijnana Vol 1. Varanasi: Chaukhambhabharati academy;2006. Section 2,chapter 1 Guna;p.153.</ref>  
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Rough (karkasha) property is mentioned by Sushruta instead of coarse (khara). He added quickly acting(ashukari), pleasant odour (sugandha), foul smell (durgandha), pervading (vyavayi) and expanding by destroying body tissues (vikashi) in the list of properties.[Su.Sa.Sutra Sthana 46/515-524]  Dehydrated (shushka) property is added by Bhavamishra.<ref>P.V.Sharma, Dravyaguna-vijnana Vol 1. Varanasi: Chaukhambhabharati academy;2006. Section 2,chapter 1 Guna;p.153.</ref>  
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Cold(sheeta), hot (ushna), unctuous (snigdha), dry (ruksha), non-slimy (vishada), slimy (pichchila), heavy (guru), light (laghu), soft (mridu) and sharp (tikshna) show specific capacity for specific functions,hence they are also termed as ‘active properties’ (karmanyaguna) [Rasavaisheshika]<ref>P.V.Sharma, Dravyaguna-vijnana Vol 1. Varanasi: Chaukhambhabharati academy;2006. Section 2,chapter 1 Guna;p.152.</ref>
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Cold(sheeta), hot (ushna), unctuous (snigdha), dry (ruksha), non-slimy (vishada), slimy (pichchila), heavy (guru), light (laghu), soft (mridu) and sharp (tikshna) show specific capacity for specific functions,hence they are also termed as ‘active properties’ (karmanyaguna) [Rasavaisheshika].<ref>P.V.Sharma, Dravyaguna-vijnana Vol 1. Varanasi: Chaukhambhabharati academy;2006. Section 2,chapter 1 Guna;p.152.</ref>
 
   
 
   
 
=== General properties (samanya guna) ===
 
=== General properties (samanya guna) ===
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These properties can be assessed by their effects or relative actions on more than one substance. The properties are essential for assessment in clinical practice and judgment. [Cha.Sa.[[Sutra Sthana]] 26/35].
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These properties can be assessed by their effects or relative actions on more than one substance. The properties are essential for assessment in clinical practice and judgment. [Cha.Sa.[[Sutra Sthana]] 26/35]
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
 
! Serial No !! General property !! Effect and assessment !! Example
 
! Serial No !! General property !! Effect and assessment !! Example
 
|-
 
|-
| | 1 || Superiority/Dominance (paratva) || It shows superiority or excellence of some substance over other. Dominance of a principle is also assessed || Amalaki is superior anti-ageing (vayasthapana)drug over other [Cha.Sa.[[Sutra Sthana]] 25/40]; Dominance of [[dosha]] in fundamental constitution ([[prakriti]]) and disease.
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| | 1 || Superiority/Dominance (paratva) || It shows superiority or excellence of some substance over other. Dominance of a principle is also assessed || Amalaki (Phyllanthus emblica) is superior anti-ageing (vayasthapana)drug over other [Cha.Sa.[[Sutra Sthana]] 25/40]; Dominance of [[dosha]] in fundamental constitution ([[prakriti]]) and disease.
 
|-
 
|-
 
| | 2 || Inferiority/dormant (aparatva) || It shows the substance with inferior or dormant quality || Sheep’s milk is inferior in quality for health in comparison to other varieties of milk.[Cha.Sa.[[Sutra Sthana]] 25/40]
 
| | 2 || Inferiority/dormant (aparatva) || It shows the substance with inferior or dormant quality || Sheep’s milk is inferior in quality for health in comparison to other varieties of milk.[Cha.Sa.[[Sutra Sthana]] 25/40]
 
|-
 
|-
| | 3 || Reasoning (yukti) || Success depends upon rational application based upon dose and time of administration. Logical reasoning is applied in clinical treatment || Poison is fatal, but if used judiciously it will act as medicine
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| | 3 || Reasoning (yukti) || Success depends upon rational application based upon dose and time of administration. Logical reasoning is applied in clinical treatment || Poison is fatal, but if used judiciously it will act as medicine.
 
|-
 
|-
 
| | 4 || Enumeration (sankya) || Counting/numbering is possible || There are three [[dosha]]s, seven [[dhatu]]
 
| | 4 || Enumeration (sankya) || Counting/numbering is possible || There are three [[dosha]]s, seven [[dhatu]]
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| | 9 || Transformation (samskara)  || The original quality of a substance is changed after processing it with other substance || Ghee when processed with medicinal drugs shows qualities of that drug
 
| | 9 || Transformation (samskara)  || The original quality of a substance is changed after processing it with other substance || Ghee when processed with medicinal drugs shows qualities of that drug
 
|-
 
|-
| | 10 || Repetition (abhyasa) || Repeated practice or consumption of a particular substance || Regular consumption of milk and ghee is best for rejuvenation [Cha.Sa.[[Sutra Sthana]] 25/40]
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| | 10 || Repetition (abhyasa) || Repeated practice or consumption of a particular substance || Regular consumption of milk and ghee is best for rejuvenation.[Cha.Sa.[[Sutra Sthana]] 25/40]
 
|-
 
|-
 
|}
 
|}
These properties are important in view of research perspectives. The comparative studies (para-aparatva), analytical studies and reasoning (yukti),statistical analysis (sankhya), combination in multi drug therapy (samyoga), pharmaceutical processing (samskara), long term follow up studies (abhyasa) are essential components of research.
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These properties are important in view of research perspectives. The comparative studies (para-aparatva), analytical studies and reasoning (yukti), statistical analysis (sankhya), combination in multi drug therapy (samyoga), pharmaceutical processing (samskara), long term follow up studies (abhyasa) are essential components of research.
    
=== Spiritual properties (adhyatmika guna)===
 
=== Spiritual properties (adhyatmika guna)===
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#Odour (gandha) property of olfactory senses (ghranendriya) and represents [[Prithvi mahabhuta]]
 
#Odour (gandha) property of olfactory senses (ghranendriya) and represents [[Prithvi mahabhuta]]
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Along with this,one more classification of guna that is mahaguna is considered. [A.S.Su.1/29]
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Along with this,one more classification of guna that is mahaguna is considered. [A.S.Sutra Sthana.1/29]
    
=== Fundamental universal properties (Mahaguna) ===
 
=== Fundamental universal properties (Mahaguna) ===
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These three are produced from the material nature during primitive evolutionary process of the Universe (prakriti). These are also termed as primary attributes of mind.[SAT-A.126]<ref name=namstp />
 
These three are produced from the material nature during primitive evolutionary process of the Universe (prakriti). These are also termed as primary attributes of mind.[SAT-A.126]<ref name=namstp />
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# Sattva guna: It means goodness. It is purest quality of mind which is responsible for knowledge, enlightenment and happiness. It is the quality of balance, harmony, goodness, purity, universalism, holism, construction, creativity, positivity, peacefulness, and virtue<ref>Alter, Joseph S., Yoga in modern India, 2004 Princeton University Press, p 55Available from https://en.wikipedia.org/wiki/Gu%E1%B9%87aaccessed on 10/07/2020</ref>.
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# Sattva guna: It means goodness. It is purest quality of mind which is responsible for knowledge, enlightenment and happiness. It is the quality of balance, harmony, goodness, purity, universalism, holism, construction, creativity, positivity, peacefulness, and virtue.<ref>Alter, Joseph S., Yoga in modern India, 2004 Princeton University Press, p 55Available from https://en.wikipedia.org/wiki/Gu%E1%B9%87aaccessed on 10/07/2020</ref>
 
   
 
   
# Rajas guna: It means passion. This is responsible for all deeds(karma), desires and sorrows. It is the quality of passion, activity, neither good nor bad and sometimes either, self-centeredness, egoism, individualization, drivenness, movement, and dynamism<ref name=Feur>Feuerstein, Georg The Shambhala Encyclopedia of Yoga, Shambhala Publications, 1997 Available from https://en.wikipedia.org/wiki/Gu%E1%B9%87aaccessed on 10/07/2020</ref>.
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# Rajas guna: It means passion. This is responsible for all deeds(karma), desires and sorrows. It is the quality of passion, activity, neither good nor bad and sometimes either, self-centeredness, egoism, individualization, drivenness, movement, and dynamism.<ref name=Feur>Feuerstein, Georg The Shambhala Encyclopedia of Yoga, Shambhala Publications, 1997 Available from https://en.wikipedia.org/wiki/Gu%E1%B9%87aaccessed on 10/07/2020</ref>
 
   
 
   
# Tamas guna: It means ignorance. This is responsible for laziness and delusions. It is the quality of imbalance, disorder, chaos, anxiety, impurity, destruction, delusion, negativity, dullness or inactivity, apathy, inertia or lethargy, violence, viciousness, and ignorance<ref name=Feur />
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# Tamas guna: It means ignorance. This is responsible for laziness and delusions. It is the quality of imbalance, disorder, chaos, anxiety, impurity, destruction, delusion, negativity, dullness or inactivity, apathy, inertia or lethargy, violence, viciousness, and ignorance.<ref name=Feur />
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In human beings, these are represented in psychological plane as purest quality, initiator and regulator of all activities respectively. Sattva is pure form of mind, while rajas and tamas are causative factors for psychiatric disorders[Cha.Sa. [[Sutra Sthana]] 1/57]. These three guna connect soul ([[atma]]) with physical body. The eternal living entity ([[atma]]) is conditioned by these three modes of goodness, passion and ignorance<ref>Bhaktivedanta Swami Prabhupada. Bhagavad-Gita As it is. Chapter 14.6. 2008. Bhaktivedanta book trust. Pg 607 </ref>. Salvation (moksha) is attained after freedom from all these properties.
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In human beings, these are represented in psychological plane as purest quality, initiator and regulator of all activities respectively. Sattva is pure form of mind, while rajas and tamas are causative factors for psychiatric disorders.[Cha.Sa. [[Sutra Sthana]] 1/57] These three guna connect soul ([[atma]]) with physical body. The eternal living entity ([[atma]]) is conditioned by these three modes of goodness, passion and ignorance.<ref>Bhaktivedanta Swami Prabhupada. Bhagavad-Gita As it is. Chapter 14.6. 2008. Bhaktivedanta book trust. Pg 607 </ref> Salvation (moksha) is attained after freedom from all these properties.
    
====Relation with [[mahabhuta]] and [[dosha]]====
 
====Relation with [[mahabhuta]] and [[dosha]]====
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|-
 
|}
 
|}
[Su.Sa. Sha 1/20 with Dallhana commentary]
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[Su.Sa. Sharira Sthana 1/20 with Dallhana commentary]
    
====Relation with [[dosha]]====
 
====Relation with [[dosha]]====
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|-
 
|-
 
|}
 
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The body components show actions according to their properties. These properties are considered while treating abnormal states<ref>Nanal R.M. Sapta dhatu and shariraguna (Marathi). In MadhujivanaShariraGunaVisheshanka (1993). Nanal Publications.pg.88-91. </ref>
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The body components show actions according to their properties. These properties are considered while treating abnormal states.<ref>Nanal R.M. Sapta dhatu and shariraguna (Marathi). In MadhujivanaShariraGunaVisheshanka (1993). Nanal Publications.pg.88-91. </ref>
    
== Relation of properties and active constituents of substances ==
 
== Relation of properties and active constituents of substances ==
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=== Potency (veerya) ===
 
=== Potency (veerya) ===
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The potency of a substance depends on the property it possesses. All substances are divided into two main categories viz. hot (ushna) and cold (sheeta) based upon their potency. [A.H.Su. 1/17]
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The potency of a substance depends on the property it possesses. All substances are divided into two main categories viz. hot (ushna) and cold (sheeta) based upon their potency. [A.H.Sutra Sthana 1/17]
    
== Factors affecting degree of effect of properties ==
 
== Factors affecting degree of effect of properties ==
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=== Seasons and predominance of properties ===
 
=== Seasons and predominance of properties ===
 
   
 
   
During hot season, the sharp (tikshna), hot (ushna) and dry (ruksha) properties are prevalent in environmental conditions. Cold (sheeta) and unctuous (snigdha) properties are predominantly present in cold season [A.H.Su.3/5]. These changes affect human biology and produces respective effects accordingly. The seasonal factor (kala) shall be considered in diagnosis and treatment.  
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During hot season, the sharp (tikshna), hot (ushna) and dry (ruksha) properties are prevalent in environmental conditions. Cold (sheeta) and unctuous (snigdha) properties are predominantly present in cold season. [A.H.Sutra Sthana.3/5] These changes affect human biology and produces respective effects accordingly. The seasonal factor (kala) shall be considered in diagnosis and treatment.  
    
=== Variations in properties ===
 
=== Variations in properties ===
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=== Different interactions of properties ===
 
=== Different interactions of properties ===
 
   
 
   
A substance may inherently possess opposite properties and show different actions accordingly. For example, Tinospora cordifolia shows properties of sweet (madhura) post digestion effect and hot potency (ushna veerya). These two are opposite in effect, however tinospora pacify [[pitta]] [[dosha]] due to its sweet effect and [[kapha]] [[dosha]] due to its hot potency. The effect of a substance is essentially observed after its interaction with human biological components. In case of interactions, the dominant property shows major impact, while the recessive property does not show any impact or shows mild effect [AH.Su 9/24].
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A substance may inherently possess opposite properties and show different actions accordingly. For example, Tinospora cordifolia shows properties of sweet (madhura) post digestion effect and hot potency (ushna veerya). These two are opposite in effect, however tinospora pacify [[pitta]] [[dosha]] due to its sweet effect and [[kapha]] [[dosha]] due to its hot potency. The effect of a substance is essentially observed after its interaction with human biological components. In case of interactions, the dominant property shows major impact, while the recessive property does not show any impact or shows mild effect. [A.H.Sutra Sthana 9/24]
    
== Importance of knowledge of guna ==
 
== Importance of knowledge of guna ==
   −
Knowledge of guna is essential in every field to define standards. The actions or effects of each substance are caused due to its properties (guna) due to inseparable concomitance[Cha.Sa. [[Sutra Sthana]] 1/50]. The knowledge about property of an object is possible through analyzing its actions only[Su.Sa.Su.46/514]. Guna is the only principle which explains the drug activity. This is to be assessed objectively through action of that drug. The taste, potency and post digestion effect (vipaka) are the different expressions of guna only<ref>KarraNishteswar, Importance of guna amongst rasapanchaka. IAMJ [Internet]. 2013 [cited 2020 May 05]; Available from:http://www.iamj.in/posts/images/upload/IAMJ_01.05.01.pdf</ref>.
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Knowledge of guna is essential in every field to define standards. The actions or effects of each substance are caused due to its properties (guna) due to inseparable concomitance.[Cha.Sa. [[Sutra Sthana]] 1/50] The knowledge about property of an object is possible through analyzing its actions only.[Su.Sa.Sutra Sthana 46/514] Guna is the only principle which explains the drug activity. This is to be assessed objectively through action of that drug. The taste, potency and post digestion effect (vipaka) are the different expressions of guna only.<ref>KarraNishteswar, Importance of guna amongst rasapanchaka. IAMJ [Internet]. 2013 [cited 2020 May 05]; Available from:http://www.iamj.in/posts/images/upload/IAMJ_01.05.01.pdf</ref>  
    
=== Importance in prevention ===
 
=== Importance in prevention ===
   −
Heaviness and lightness in relation to digestibility of food items is considered to decide appropriate quantity of food and preserve the equilibrium state of digestion and metabolism (agni) [Cha.Sa[[Sutra Sthana]] 5/6].
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Heaviness and lightness in relation to digestibility of food items is considered to decide appropriate quantity of food and preserve the equilibrium state of digestion and metabolism (agni). [Cha.Sa[[Sutra Sthana]] 5/6]
   −
In order to preserve health, one shall follow the diet and regimens opposite to the qualities of the habitat and causative factors of the diseases prevalent in that region. E.g. if the person belongs to marshy area, which is predominant in oiliness (sneha), heaviness (gaurava) etc. properties, then he shall follow the diet possessing the properties dryness, lightness etc. [Cha.Sa. [[Sutra Sthana]] 6/50].
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In order to preserve health, one shall follow the diet and regimens opposite to the qualities of the habitat and causative factors of the diseases prevalent in that region. E.g. if the person belongs to marshy area, which is predominant in oiliness (sneha), heaviness (gaurava) etc. properties, then he shall follow the diet possessing the properties dryness, lightness etc. [Cha.Sa. [[Sutra Sthana]] 6/50]
    
=== Importance in diagnosis ===
 
=== Importance in diagnosis ===
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Guna of a substance shall be understood properly to know cause, pathogenesis and treatment of a disease. Some examples are as given below:
 
Guna of a substance shall be understood properly to know cause, pathogenesis and treatment of a disease. Some examples are as given below:
 
   
 
   
Excess consumption of diet and lifestyle having similar properties to [[dosha]] and opposite to [[dhatu]] are causative factors for vitiation of channels of transport and transformation of body constituents (srotasa)[Cha.Sa. [[Vimana Sthana]] 5/23] [A.H.Sha.3/44].
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Excess consumption of diet and lifestyle having similar properties to [[dosha]] and opposite to [[dhatu]] are causative factors for vitiation of channels of transport and transformation of body constituents (srotasa). [Cha.Sa. [[Vimana Sthana]] 5/23] [A.H.Sharira Sthana 3/44]
    
Excess use of substances having dry and cold property can cause [[vata]] dominant diseases[Cha.Sa. [[Chikitsa Sthana]]28/15], exposure to hot substances causes hemorrhagic disorders (raktapitta) and consumption of unctuous substance can cause obstinate urinary diseases (prameha).
 
Excess use of substances having dry and cold property can cause [[vata]] dominant diseases[Cha.Sa. [[Chikitsa Sthana]]28/15], exposure to hot substances causes hemorrhagic disorders (raktapitta) and consumption of unctuous substance can cause obstinate urinary diseases (prameha).
 
   
 
   
In pathogenesis of abdominal lumps and tumors (gulma), the body channels are hardened due to dryness (ruksha)[Cha.Sa. [[Nidana Sthana]] 3/7]. Skin becomes excessively dry or excessively smooth in skin diseases due to increased dryness of [[vata]][[dosha]] and unctuousness of [[kapha]][[dosha]] respectively.[ Cha.Sa. [[Chikitsa Sthana]] 7/34-36].
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In pathogenesis of abdominal lumps and tumors (gulma), the body channels are hardened due to dryness (ruksha).[Cha.Sa. [[Nidana Sthana]] 3/7] Skin becomes excessively dry or excessively smooth in skin diseases due to increased dryness of [[vata]][[dosha]] and unctuousness of [[kapha]][[dosha]] respectively.[ Cha.Sa. [[Chikitsa Sthana]] 7/34-36]
    
Mobility (chalatva) is a property of [[vata]][[dosha]]. If this property is lost in a subject, that can be inferred as an abnormal reduction in [[vata]][[dosha]]. This type of properties can be assessed in patients in the form of signs and symptoms in order to estimate the amount of [[dosha]].
 
Mobility (chalatva) is a property of [[vata]][[dosha]]. If this property is lost in a subject, that can be inferred as an abnormal reduction in [[vata]][[dosha]]. This type of properties can be assessed in patients in the form of signs and symptoms in order to estimate the amount of [[dosha]].
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===Importance in treatment===
 
===Importance in treatment===
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In treatment, the depleted levels of body components are increased by administration of dietary and medicinal substances (dravya) having similar properties (guna) and effects (karma). Similarly, the increased levels are lessened by administration of those having opposite properties. Thus, the equilibrium is maintained [Cha.Sa. [[Sharira Sthana]] 6/9].
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In treatment, the depleted levels of body components are increased by administration of dietary and medicinal substances (dravya) having similar properties (guna) and effects (karma). Similarly, the increased levels are lessened by administration of those having opposite properties. Thus, the equilibrium is maintained. [Cha.Sa. [[Sharira Sthana]] 6/9]
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Diseases are caused due to abnormality in [[dosha]]. The skillful use of medicines, diet and regimens having opposite qualities of causative or abnormal [[dosha]] helps to cure the disease [Cha.Sa. [[Sutra Sthana]] 1/62]. The diseases caused due to aggravated [[vata]][[dosha]] can be treated with regimens having hot (ushna) and oily (snigdha)properties. Regimen with cold (sheeta), soft (mridu) and slimy (pichchila) properties pacifies [[pitta]][[dosha]]. Regimen with sharp (tikshna), dry (ruksha) and non-slimy (vishada)properties reduce [[kapha]][[dosha]][Su.Sa.Su.41/11]. The physician must know properties of the herbs. Usage of herbs without knowing its complete properties can cause harmful effects [Cha.Sa[[Sutra Sthana]] 1/125]].
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Diseases are caused due to abnormality in [[dosha]]. The skillful use of medicines, diet and regimens having opposite qualities of causative or abnormal [[dosha]] helps to cure the disease. [Cha.Sa. [[Sutra Sthana]] 1/62] The diseases caused due to aggravated [[vata]][[dosha]] can be treated with regimens having hot (ushna) and oily (snigdha)properties. Regimen with cold (sheeta), soft (mridu) and slimy (pichchila) properties pacifies [[pitta]][[dosha]]. Regimen with sharp (tikshna), dry (ruksha) and non-slimy (vishada)properties reduce [[kapha]][[dosha]].[Su.Sa.Sutra Sthana.41/11] The physician must know properties of the herbs. Usage of herbs without knowing its complete properties can cause harmful effects. [Cha.Sa[[Sutra Sthana]] 1/125]]
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Herbs with specific properties are administered in therapeutic procedures. In therapeutic emesis ([[vamana]]),medicines with lightness property (laghuguna) are selected. This helps to expel [[dosha]] through the upward direction i.e. mouth. Similarly, medicines with heaviness (guru) property are selected for therapeutic purgation ([[virechana]]). This helps in downward movement of [[dosha]] to expel through anal route [Su.Sa.Su.41/6].
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Herbs with specific properties are administered in therapeutic procedures. In therapeutic emesis ([[vamana]]),medicines with lightness property (laghuguna) are selected. This helps to expel [[dosha]] through the upward direction i.e. mouth. Similarly, medicines with heaviness (guru) property are selected for therapeutic purgation ([[virechana]]). This helps in downward movement of [[dosha]] to expel through anal route. [Su.Sa.Sutra Sthana 41/6]
    
==Research perspectives==
 
==Research perspectives==
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| | 1 || Heavy (guru)-Light(laghu) || Weight of solids/ volume of liquids and gaseous substances || Feeling of heaviness or lightness based on grading scores
 
| | 1 || Heavy (guru)-Light(laghu) || Weight of solids/ volume of liquids and gaseous substances || Feeling of heaviness or lightness based on grading scores
 
|-
 
|-
| | 2 || Slow/dull (manda) and sharp (tikshna) || Speed of action, effect, release, Slow response or fast response, fast acting, slow acting substances || Feeling of dullness or sharpness  
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| | 2 || Slow/dull (manda) and sharp (tikshna) || Speed of action, effect, release, slow response or fast response, fast acting, slow acting substances || Feeling of dullness or sharpness  
 
|-
 
|-
 
| | 3 || Cold (sheeta)-hot (ushna) || Temperature and generation of heat, boiling point and freezing point || Feeling of warmth/burning sensation or dampness
 
| | 3 || Cold (sheeta)-hot (ushna) || Temperature and generation of heat, boiling point and freezing point || Feeling of warmth/burning sensation or dampness
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==Contemporary views==
 
==Contemporary views==
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The physical properties are measurable, whose value describes a state of a physical system. These are listed as below<ref>Available from https://en.wikipedia.org/wiki/Physical_property accessed on 10/07/2020</ref>. The probable correspondent guna is given as below. However, it shall be clear that the guna concept of Ayurveda shows some biological effect after interaction with human biology. Whereas the physical properties of a substance are observed in vitro and not necessarily show the same biological effect as of guna. More research is needed to study the degree of co-relation of the same.  
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The physical properties are measurable, whose value describes a state of a physical system. These are listed as below.<ref>Available from https://en.wikipedia.org/wiki/Physical_property accessed on 10/07/2020</ref>  The probable correspondent guna is given as below. However, it shall be clear that the guna concept of Ayurveda shows some biological effect after interaction with human biology. Whereas the physical properties of a substance are observed in vitro and not necessarily show the same biological effect as of guna. More research is needed to study the degree of co-relation of the same.  
    
{| class="wikitable"
 
{| class="wikitable"
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==Current researches==
 
==Current researches==
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Some experimental research studies have been conducted to refine the objective parameters used for assessing unctuousness-dryness (snigdha-ruksha) and cold-hot (sheeta-ushna) properties by employing suitable pharmacological models. Absolute evaluation of one guna is not possible in a living body since there are infinite factors related to each and every biological event. Metabolic study (dipana pachana experiment), intestinal secretion and motility test, and swimming stress test (swimming induced hypothermia) have been employed to assess the effects of various drugs having unctuous-dry, cold-hot properties. Drugs with cold and unctuous properties have shown to increase in body weight in metabolic experiments compared to drugs with hot and dry properties.  Drugs with unctuous property alleviated stress-induced hypothermia, drugs with dry property aggravated it.<ref>Supriya. S. Balerao A comprehensive study of gunas and evolution of some ojective parameters in the context of snigdha and ruksha gunas Thesis, IPGT&RA, Gujarat Ayurved University, Jamnagar,1998</ref> <ref>Santosh Mane Evolution and evaluation of some objective parameters for ushna and shita gunas based on panchabhoutik theory and experiments. Thesis,IPGT&RA, Gujarat Ayurved University, Jamnagar,2008</ref>
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Some experimental research studies have been conducted to refine the objective parameters used for assessing unctuousness-dryness (snigdha-ruksha) and cold-hot (sheeta-ushna) properties by employing suitable pharmacological models. Absolute evaluation of one guna is not possible in a living body since there are infinite factors related to each and every biological event. Metabolic study (dipana pachana experiment), intestinal secretion and motility test, and swimming stress test (swimming induced hypothermia) have been employed to assess the effects of various drugs having unctuous-dry, cold-hot properties. Drugs with cold and unctuous properties have shown to increase in body weight in metabolic experiments compared to drugs with hot and dry properties.  Drugs with unctuous property alleviated stress-induced hypothermia, drugs with dry property aggravated it.<ref>Supriya. S. Balerao A comprehensive study of gunas and evolution of some objective parameters in the context of snigdha and ruksha gunas Thesis, IPGT&RA, Gujarat Ayurved University, Jamnagar,1998</ref> <ref>Santosh Mane Evolution and evaluation of some objective parameters for ushna and shita gunas based on panchabhoutik theory and experiments. Thesis,IPGT&RA, Gujarat Ayurved University, Jamnagar,2008</ref>
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In another clinical research, the administration of drugs with dry property showed significant reduction in serum cholesterol levels in patients of hyperlipidemia. Hyperlipidemia is considered as elevated unctuousness in body.<ref>Mishra S, Dwivedi R R, Ravishankar B. Conceptual and applied study of Snigdha and RuksaGuna with special reference to Rasa-raktagata Sneha (hyperlipidemia). AYU [serial online] 2011 [cited 2020 Jul 8];32:200-6. Available from: http://www.ayujournal.org/text.asp?2011/32/2/200/92586</ref>
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In another clinical research, the administration of drugs with dry property showed significant reduction in serum cholesterol levels in patients of hyperlipidemia. Hyperlipidemia is considered as elevated unctuousness in body.<ref>Mishra S, Dwivedi R R, Ravishankar B. Conceptual and applied study of Snigdha and Ruksa Guna with special reference to Rasa-raktagata Sneha (hyperlipidemia). AYU [serial online] 2011 [cited 2020 Jul 8];32:200-6. Available from: http://www.ayujournal.org/text.asp?2011/32/2/200/92586</ref>
 
    
 
    
 
A research on combination of drugs (samyoga) can enhance efficacy. The combination of Terminalia chebula (Haritaki) and rock salt (saindhava lavana) showed enhanced efficacy in patients of cough with expectoration(kaphajakasa) as compared to their effect as separate drugs.<ref>Rout AK, Dwivedi R R. A clinical study of Haritaki and SaindhavaLavana in KaphajaKasa with special reference to SamyogaGuna. AYU [serial online] 2011 [cited 2020 Jul 10];32:357-60. Available from: http://www.ayujournal.org/text.asp?2011/32/3/357/93914</ref>
 
A research on combination of drugs (samyoga) can enhance efficacy. The combination of Terminalia chebula (Haritaki) and rock salt (saindhava lavana) showed enhanced efficacy in patients of cough with expectoration(kaphajakasa) as compared to their effect as separate drugs.<ref>Rout AK, Dwivedi R R. A clinical study of Haritaki and SaindhavaLavana in KaphajaKasa with special reference to SamyogaGuna. AYU [serial online] 2011 [cited 2020 Jul 10];32:357-60. Available from: http://www.ayujournal.org/text.asp?2011/32/3/357/93914</ref>
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[[Atreyabhadrakapyiya Adhyaya]]
 
[[Atreyabhadrakapyiya Adhyaya]]
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==List of references==
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The list of references for Guna in Charak Samhita can be seen [[Media:References_of_word_Guna_in_Charaka.pdf|here]]
    
==References==
 
==References==
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