The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
The walls of a garden should be high enough to keep the world out, but low enough to let the sky in.
花园的墙应该足够高以将世界挡在外面，但又足够低以让天空进来。
学习数学的唯一方法就是做数学。
始终保持你的刀锋利，你的智慧更锋利，你的精神最锋利。
I don't know where I'm gonna be in five years, but I'm gonna be working my butt off to get there.
The only limits you have are the ones you set for yourself.