Teachers are the most important role models in schools, the most instructive examples, and the most vivid examples for students.

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

真理并不总是美丽的，美丽的话语也不总是真理。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.