数学中的每个问题都是一个等待解决的谜题，而乐趣就在于解决的过程。

The only constant is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.

对你帮助最大的书是那些让你思考最多的书。

心理学必须建立在生活经验的事实基础上。