Wisdom is the daughter of experience

Test knowledge through experience, be prepared to make mistakes, and be persistent about it.

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

The body of the earth is of the nature of a fish... because it draws water as its breath instead of air.

Just as iron rusts from disuse, and stagnant water putrefies, or when cold turns to ice, so our intellect wastes unless it is kept in use.

Patience serves as a protection against wrongs as clothes do against cold. For if you put on more clothes as the cold increases, it will have no power to hurt you. So in like manner you must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.

The motions of men must be such as suggest their dignity or their baseness.