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.
The Master said, At fifteen I set my heart upon learning. At thirty, I had planted my feet firm upon the ground. At forty, I no longer suffered from perplexities. At fifty, I knew what were the biddings of Heaven. At sixty, I heard them with docile ear. At seventy, I could follow the dictates of my own heart; for what I desired no longer overstepped the boundaries of righ.
The way of Heaven and Earth may be completely declared in one sentence: They are without any doubleness, and so they produce things in a manner that is unfathomable.
The superior man, while his parents are alive, reverently nourishes them; and, when they are dead, reverently sacrifices to them. His thought to the end of his life is how not to disgrace them.
The wise men of antiquity, when they wished to make the whole world peaceful and happy, first put their own States into proper order. Before putting their States into proper order, they regulated their own families. Before regulating their families, they regulated themselves. Before regulating themselves, they tried to be sincere in their thoughts. Before being sincere in their thoughts, they tried to see things exactly as they really were.