When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it - this is knowledge.

To throw oneself into strange teachings is quite dangerous.

The inner nature of man is the province of Music.

In teaching there should be no distinction of classes.

The book salesman should be honored because he brings to our attention, as a rule, the very books we need most and neglect most.

Return good for good; return evil with justice.

The gods should certainly be revered, but kept at a distance... . The way is not beyond man; he who creates a way outside of man cannot make it a true way. A good man is content with changing man, and that is enough for him.