Flow is being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost.

每一本书都是一个世界，作者是那个世界的创造者，读者则是那个世界的探索者。

必须要活得很深刻，才能找到真相。

数学的本质在于它的自由。

最古老、最简短的词语——'是'和'否'——是需要最多思考的。

"In the end, we will remember not the words of our enemies, but the silence of our friends."