Nature never breaks her own laws.

Experience does not err. Only your judgments err by expecting from her what is not in her power.

Motion is created by the destruction of balance.

He who wishes to see how the soul inhabits the body should look to see how that body uses its daily surroundings. If the dwelling is dirty and neglected, the body will be kept by its soul in the same condition, dirty and neglected.

The cat is nature's masterpiece.

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

It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.