Let no one ignorant of Mathematics enter here.

If a man says that it is right to give every one his due, and therefore thinks within his own mind that injury is due from a just man to his enemies but kindness to his friends, he was not wise who said so, for he spoke not the truth, for in no case has it appeared to be just to injure any one.

There are three classes of men; lovers of wisdom, lovers of honor, and lovers of gain.

The Earth is like one of those balls made of twelve pieces of skin.

He who is gracious to his lover under the impression that he is rich, and is disappointed of his gains because he turns out to be poor, is disgraced all the same: for he has done his best to show that he would give himself up to any one's "uses base" for the sake of money; but this is not honourable.

If there is no contradictory impression, there is nothing to awaken reflection

Harmony is a symphony, and symphony is an agreement; but an agreement of disagreements while they disagree there cannot be; you cannot harmonize that which disagrees.