Everyone holds his fortune in his own hands, like a sculptor the raw material he will fashion into a figure. But it's the same with that type of artistic activity as with all others: We are merely born with the capability to do it. The Skill to mold the material into what we want must be learned and attentively cultivated.

The unnatural, that too is natural.

Most pioneers are at the mercy of doubt at the beginning, whether of their worth, of their theories, or of the whole enigmatic field in which they labour.

Self-knowledge comes from knowing other men.

Every day I observe more and more the folly of judging of others by ourselves; and I have so much trouble with myself, and my own heart is in such constant agitation, that I am well content to let others pursue their own course, if they only allow me the same privilege.

A person places themselves on a level with the ones they praise.

Hypotheses are lullabies for teachers to sing their students to sleep.