To know is to know that you know nothing. That is the meaning of true knowledge.

When we have intelligence resulting from sincerity, this condition is to be ascribed to nature; when we have sincerity resulting from intelligence, this condition is to be ascribed to instruction. But given the sincerity, and there shall be the intelligence; given the intelligence, and there shall be the sincerity.

A youth is to be regarded with respect.

A youth is to be regarded with respect. How do we know that his future will not be equal to our present? If he reach the age of forty or fifty, and has not made himself heard of, then indeed he will not be worth being regarded with respect.

What you know, you know, what you don't know, you don't know. This is true wisdom.

The superior man * * * in regard to his speech * * * is anxious that it should be sincere.

Who keeps the old akindle and adds new knowledge is fitted to be a teacher.