Behavior is not just a response to a stimulus, but is guided by expectations and purposes.

The real violence is the violence we do to ourselves when we’re too afraid to be who we really are.

大自然赋予我形体使我负载，赋予我生命使我劳碌，使我变老以得到安闲，使我死亡以得到安息。所以能把活着当作好事，也就能把死去当作好事了。

永远不要问一位女士是否怀孕了，需要时她会说出来。

The art of doing mathematics consists in finding that special case which contains all the germs of generality.