Aristotle, Nicomachean Ethics
H. Rackham, Ed.

The temperate man keeps a middle course in these matters. He takes no pleasure at all in the things that the profligate enjoys most, on the contrary, he positively dislikes them; nor in general does he find pleasure in wrong things, nor excessive pleasure in anything of this sort; nor does he feel pain or desire when they are lacking, or only in a moderate degree, not more than is right, nor at the wrong time, et cetera. But such pleasures as conduce to health and fitness he will try to obtain in a moderate and right degree; as also other pleasures so far as they are not detrimental to health and fitness, and not ignoble, nor beyond his means. The man who exceeds these limits cares more for such pleasures than they are worth. Not so the temperate man; he only cares for them as right principle enjoins.