There are three things to beware of through life: when a man is young, let him beware of his appetites; when he is middle-aged, of his passions; and when old, of covetousness, especially.

The green reed which bends in the wind is stronger than the mighty oak which breaks in a storm.

To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.

Future generation is the most important thing.

Sincerity is the way of heaven.

Better a diamond with a flaw than a pebble without.

You can successfully force people to follow a certain course, but you cannot force them to understand it.