The cold, the warin (phlegm and bile) as well as the windy humours, O king, are the essential changes created in the physical body, and when these humours are equally distributed, and are present in due proportions, they indicate good health.
शीतोष्णे चैव वायुश्च गुणा राजन् शरीरजाः। तेषां गुणानां साम्यं चेत् तदाहुः स्वस्थलक्षणम्॥