What is sufficient for health is not enough for pleasure. And it is often a matter of doubt whether it is the needful care of the body that still calls for food or whether it is the sensual snare of desire still wanting to be served. In this uncertainty my unhappy soul rejoices, and uses it to prepare an excuse as a defense. It is glad that it is not clear as to what is sufficient for the moderation of health, so that under the pretense of health it may conceal its projects for pleasure.
Augustine, Confessions, as translated by A. Outler, Book 10, Chapter 31, p. 197