When you are laboring for others, let it be with the same zeal as if it were for yourself.

Women and people of low birth are very hard to deal with. If you are friendly to them, they get out of hand, and if you keep your distance, they resent it.

Old age, believe me, is a good and pleasant thing. It is true you are gently shouldered off the stage, but then you are given such a comfortable front stall as spectator.

Unify your attention. Do not listen with your ears, but with your mind. Do not listen with your mind but with your essence.

Acquire new knowledge whilst thinking over the old, and you may become a teacher of others.

True knowledge is when one knows the limitations of one's knowledge.

A hammer shatters glass but it also forges steel.