Sometimes you have to be alone to truly find yourself.

The mind is an active, dynamic process, not a passive receptacle.

The merit of Marx is that he suddenly produces a qualitative change in the history of social thought. He interprets history, understands its dynamic, predicts the future, but in addition to predicting it, he expresses a revolutionary concept: the world must not only be interpreted, it must be transformed.

你看，在生活中，很多人知道该做什么，但很少有人真正去做他们知道的事情。知道是不够的！你必须采取行动。

The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.