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Out of these six categories, ''dravya, guna'' and ''karma'' truly exist. ''Samanya, vishesha'' and ''samavaya'' do not exist in the physical world. They exist in a metaphysical sense.

Out of these six categories, ''dravya, guna'' and ''karma'' truly exist. ''Samanya, vishesha'' and ''samavaya'' do not exist in the physical world. They exist in a metaphysical sense.

==== Definition of Ayurveda ====

==== Definition of [[Ayurveda]] ====

Here four types of ''ayu'' are mentioned. Happy and unhappy life are more related to personal happiness or unhappiness. But there is good or righteous life and bad or sinful life also, where the person affects the harmony between his self and his surrounding. His/her acts do not impact just him or her, as an individual, but the society at large as well. There is a ''karmic'' consideration of one’s actions that could impact one’s life after death as well. Details of these are described in [[Sutra Sthana]], Chapter 30. Ayurveda describes factors beneficial and non beneficial for all these four types of life. Ayurveda also describes ''ayu pramana'' (the span of life). This is described in two ways. In the 8th chapter of [[Sutra Sthana]], guidelines to understand signs to predict longevity in new born babies are described. Methods like ''dashavidha pareeksha'' (ten point examination) also help in understanding the life span of a person. On the other hand, the section [[Indriya Sthana]] helps to predict or understand the circumstances leading to the death of a person in near future, i.e. when the life span comes to an end. Ayurveda also describes ''ayu'' itself i.e. definition and understanding about ''Ayu''.

Here four types of ''ayu'' are mentioned. Happy and unhappy life are more related to personal happiness or unhappiness. But there is good or righteous life and bad or sinful life also, where the person affects the harmony between his self and his surrounding. His/her acts do not impact just him or her, as an individual, but the society at large as well. There is a ''karmic'' consideration of one’s actions that could impact one’s life after death as well. Details of these are described in [[Sutra Sthana]], Chapter 30. Ayurveda describes factors beneficial and non beneficial for all these four types of life. Ayurveda also describes ''ayu pramana'' (the span of life). This is described in two ways. In the 8th chapter of [[Sutra Sthana]], guidelines to understand signs to predict longevity in new born babies are described. Methods like ''dashavidha pareeksha'' (ten point examination) also help in understanding the life span of a person. On the other hand, the section [[Indriya Sthana]] helps to predict or understand the circumstances leading to the death of a person in near future, i.e. when the life span comes to an end. Ayurveda also describes ''ayu'' itself i.e. definition and understanding about ''Ayu''.