De parasito sive artem esse parasiticam

Lucian of Samosata

Lucian, Vol. 3. Harmon, A. M., editor. London: William Heinemann, Ltd.; Cambridge, MA: Harvard University Press, 1921.

Furthermore, those who wish to be successful in the other arts eat little and drink little, like invalids, and it is impossible to learn them while one is rejoicing the inner man with plenty of food and plenty of wine.