The Compendium of Caraka 1.25.35

1.25.35

tamuvāca bhagavānātreyaḥ yeṣāṃ hi viditamāhāratattvamagniveśa guṇato dravyataḥ karmtaḥ sarvāvayavaśaśca mātrādayo bhāvāḥ ta etadevamupadiṣṭaṃ vijñātumutsahante /

The blessed Ātreya said to him: “For those, Agniveśa, who understand the true nature of food according to property, substance, and action, and all factors such as measure in every detail, are capable of understanding it when taught in this manner.