Three qualities of educated people: profound knowledge, thinking habits and noble sentiments. (Chernyshevski)
Three ways to learn knowledge: thinking, thinking and rethinking. (Einstein)
Life must have "three kinds of minds": one is born, the other is obtained from books, and the other is obtained from life. (Chekhov)
The "three keys" of wisdom: a number, a letter and a note. (Hugo)
There are "three things" that will never come back: the arrows shot, the words spoken and the days spent. (Dumell)
Three kinds of rocks in life: complacency, conceit and credulity. (Balzac)
People need "three kinds of knowledge": theory, practice and discrimination. (Aristotle)
To become a great cause, you must go through three levels: climb a tall building alone and look at the end of the world; I will not regret that my belt is getting wider, and I will languish for Iraq; Looking for him in the crowd, suddenly looking back, the man was in the dim light. (Wang Guowei)