活着是世界上最罕见的事情。大多数人只是存在，仅此而已。
To live is the rarest thing in the world. Most people exist, that is all.
引用《像马一样思考》
I am too intelligent, too demanding, and too resourceful for anyone to be able to take charge of me entirely. No one knows me or loves me completely. I have only myself.
数学的研究是所有智力和精神进步不可或缺的基础。
I believe that love is a better teacher than the sense of duty， he said， at least for me.
过去是一个不会停止纠缠你的幽灵。
