It is also necessary to accustom the body to become alienated, as much as possible, from the pleasure of the satiety arising from luxurious food, but not from the fullness produced by a slender diet, in order that moderation may proceed through all things, and that what is necessary, or what is most excellent, may fix a boundary to our diet. For he who thus mortifies his body will receive every possible good, through being sufficient to himself, and an assimilation to divinity.

—St. Porphyry, On Abstinence From Animal Food, Book 1