Be slow to fall into friendship; but when thou art in, continue firm & constant.

The hardest task needs the lightest hand or else its completion will not lead to freedom but to a tyranny much worse than the one it replaces.

If one knows what is right, he will do it; nobody wants to be evil

The understanding of mathematics is necessary for a sound grasp of ethics.

When desire, having rejected reason and overpowered judgment which leads to right, is set in the direction of the pleasure which beauty can inspire . . .

One ought not to return injustice, nor do evil to anybody in the world, no matter what one may have suffered from them.

Marry a good woman, and be happy the rest of your life. Or, marry a bad, and become a good philosopher