"To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others."
你越深入数学，就越意识到还有多少未知。
I always knew I was going to be rich. I don’t think I ever doubted it for a minute.
Parents wonder why the streams are bitter, when they themselves have poisoned the fountain.
Most of us spend too much time on what is urgent and not enough time on what is important.