Know yourself and you will win all battles. The Art Of War

And are not the temperate exactly in the same case? They are temperate because they are intemperate—which may seem to be a contradiction, but is nevertheless the sort of thing which happens with this foolish temperance. For there are pleasures which they must have, and are afraid of losing; and therefore they abstain from one class of pleasures because they are overcome by another: and whereas intemperance is defined as "being under the domination of pleasure," they overcome only because they are overcome by pleasure. The Trials Of Socrates

No man ever steps in the same river twice, for it's not the same river and he's not the same man Fragments

From Apollonius, true liberty, and unvariable steadfastness, and not to regard anything at all, though never so little, but right and reason: and always..that it was possible for the same man to be both vehement and remiss: a man not subject to be vexed, and offended with the incapacity of his scholars and auditors in his lectures and expositions. Book I