The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.

Singing is about expressing what cannot be said in words.

We are drowning in information but starved for knowledge.

The moment you stop trying is the moment you start dying.

质数就是当你把所有模式都剔除后剩下的东西。我觉得质数就像生活，它们非常有逻辑性，但你永远无法找出规律，即使你花上一辈子时间去思考。

自由的代价是永恒的警惕。