Hold faithfulness and sincerity as first principles.
He who speaks without modesty will find it difficult to make his words good.
To be truly happy and contented, you must let go of what it means to be happy or content.
The superior man is slow in his words and earnest in his conduct.
To know is to know that you know nothing. That is the meaning of true knowledge.
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.