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hitāhitaṃ sukhaṃ duhkham āyus tasya hitāhitam,
mānaṃ ca tac ca yatroktam āyurvedaḥ sa ucyate. Ca. Sū. 1/41

Āyurveda is said to be that science where what is useful and detrimental (to health/life); the happy and unhappy (states of) life; what is good and bad for life, its measurement (span/length) of life itself are described.