Better a good enemy than a bad friend.

The ludicrous state of solid geometry made me pass over this branch.

Any city, however small, is in fact divided into two, one the city of the poor, the other of the rich; these are at war with one another.

Fly from the company of the wicked--fly and turn not back.

To be curious about that which is not one's concern while still in ignorance of oneself is ridiculous.

Mankind censure injustice fearing that they may be the victims of it, and not because they shrink from committing it.

And what shall he suffer who slays him who of all men, as they say, is his own best friend? I mean the suicide, who deprives himself by violence of his appointed share of life. Not because the law of the state requires him. Nor yet under the compulsion of some painful and inevitable misfortune which has come upon him. Nor because he has had to suffer from irremediable and intolerable shame, but who from sloth or want of manliness imposes upon himself an unjust penalty.