善不是出自内心的，不能保留；行为不能从自身辩明的，不能去做。善不是出自内心的，只能够勉强支撑一时，必然不能长久。所以也只能使伪善。

The best way to ensure peace is to maintain a balance of power among the great powers.

I strongly believe that missionaries make better products. They care more. For a missionary， it's not just about the business. There has to be a business， and the business has to make sense， but that's not why you do it. You do it because you have something meaningful that motivates you.

孔子说：“明智的人不会迷惑，仁爱的人不会忧愁，勇敢的人不会害怕。”

Social progress requires the organic combination of individual freedom and social responsibility.

数学的本质不是把简单的事情复杂化，而是把复杂的事情简单化。