如果你想在数学上取得进步，你必须习惯于不舒服。

Duty is the most sublime word in our language. Do your duty in all things. You cannot do more. You should never wish to do less.

In energy, as in life, the only constant is change.

我们都是自己选择的总和，也是他人为我们做出的选择的总和。

真实总是通过象征来中介。