We do not learn from experience... we learn from reflecting on experience.

被大胆说出的预言，从来不会被迷信的人认为是愚笨无趣的。

激发对一门学科兴趣的最好方法是使其值得了解，这意味着要使知识可用。

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

所以发表言论有三条准则,哪三种准则呢？第一是审查本质,第二是推理情理,第三是用于实践。