All wisdom is rooted in learning to call things by the right name. When things are properly identified, they fall into natural categories and understanding becomes orderly.

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

The gentleman is calm and at ease. The gentleman is dignified but not proud; the small man is proud but not dignified.

I do not enlighten those who are not eager to learn, nor arouse those who are not anxious to give an explanation themselves. If I have presented one corner of the square and they cannot come back to me with the other three, I should not go over the points again.

A blemish may be removed from a diamond by careful polishing, but evil words once spoken cannot be effaced.

Real knowledge is to know the extent of one's ignorance.

Reading without thinking will confuse you.Thinking without reading will place you in danger.