It is better not to proceed at all than to proceed without purpose.

If you look into your own heart, and you find nothing wrong there, what is there to worry about? What is there to fear?

There are three things against which the wise man guards: lust when young, quarrels when strong, and covetousness when old.

Among the appliances to transform the people, sound and appearances are but trivial influences.

A youth is to be regarded with respect.

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

You cannot open a book without learning something.