Character is made by many acts; it may be lost by a single one.

A promise made must be a promise kept.

The misanthrope, as an essentially solitary man, is not a man at all: he must be a beast or a god.

The more you know, the more you know you don't know.

In a word, acts of any kind produce habits or characters of the same kind. Hence we ought to make sure that our acts are of a certain kind; for the resulting character varies as they vary. It makes no small difference, therefore, whether a man be trained in his youth up in this way or that, but a great difference, or rather all the difference.

Happiness is the highest good

It is our choice of good or evil that determines our character, not our opinion about good or evil.