Faced with what is right, to leave it undone shows a lack of courage.

Knowing it does not compare with loving it; loving it does not compare with delighting in it.

If a man takes no thought about what is distant he will find sorrow near at hand.

Is it not indeed a pleasure to acquire knowledge and constantly to exercise oneself therein?

The gentleman understands rightousness, the petty man understands interest.

Learning without thought is labor, lost thought without learning is perilous.

Settle one difficulty, and you keep a hundred away.