Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.

The mind is a continuous stream of events.

极不切实际的梦想即使没有实际权力做后盾，一样可以让人产生最大无畏的胆气。这是因为，怀有大希望者的力量可以有最荒谬的来源：一个口号、一句话或一枚徽章。

要想端正自身行为，先要端正自己的身心；要想处理好天下大事，先要处理好身边小事。