如果你想成为真理的真正追求者，那么在你的一生中至少要有一次尽可能怀疑一切。

There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false. A thing is not necessarily either true or false; it can be both true and false.

数学的美在于它允许我们抽象出现实世界的复杂性，专注于基本原则。