There are innumerable worlds of different sizes. In some there is neither sun not moon, in others they are larger than in ours and others have more than one. These worlds are at irregular distances, more in one direction and less in another, and some are flourishing, others declining. Here they come into being, there they die, and they are distroyed by collision with one another. Some of the worlds have no animal or vegetable life nor any water.

Nature . . . has buried truth deep in the bottom of the sea.

Magnanimity consists in enduring tactlessness with mildness.

The man who is fortunate in his choice of son-in-law gains a son; the man unfortunate in his choice loses his daughter also.

I would rather discover one true cause than gain the kingdom of Persia.

The brave man is not only he who overcomes the enemy, but he who is stronger than pleasures. Some men are masters of cities, but are enslaved to women.

Happiness resides not in possessions, and not in gold, happiness dwells in the soul.