Concerning the Nature of Good, Against the Manichæans 21
21 From Measure Things are Said to Be Moderate-Sized PL 42, 557
Therefore now by common usage things small and mean are said to have measure, because some measure remains in them, without which they would no longer be moderate-sized, but would not exist at all. But those things that by reason of too much progress are called immoderate, are blamed for very excessiveness; but yet it is necessary that those things themselves be restrained in some manner under God who has disposed all things in extension, number, and weight.
Modica a modo dicta. Ideo quippe et parva atque exigua jam communi loquendi usu modica dicuntur, quia modus in eis aliquis restitit, sine quo non jam modica, sed omnino nulla sunt. Illa autem quae propter nimium progressum dicuntur immodica, ipsa nimietate culpantur: sed tamen ipsa etiam sub Deo, qui omnia in mensura, et in numero, et pondere disposuit , necesse est ut aliquo modo cohibeantur.