凡是大国之所以不攻打小国的，必定是由于这个小国粮食充足，城郭修筑坚固，上下和谐一心。 

我们感知世界的方式深受我们过去的经历和我们讲述给自己的故事的影响。

数学理论的真正价值在于它能够连接看似无关的想法。

The truth is rarely pure and never simple.

The most dangerous poison is the feeling of achievement. The antidote is to think like a beginner every morning.

Health is not a privilege of the rich, but a vulnerability of the poor.