If you aren't in over your head, how do you know how tall you are?

即使是最坚强的灵魂，也会被爱击垮。

When you solve a mathematical problem, you don't just get the answer - you understand why it's the answer.

不要害怕失败，因为每一次失败都是成功的练习。

抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。