每个圣人都有过去,每个罪人都有未来。
Every mathematical problem has a solution, but not every solution is immediately apparent.
I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.
名声不是生活中最重要的东西,最重要的是快乐。
The greatest happiness for the laborer consists in having an abundant supply of the necessaries of life.
在一个充满仇恨的世界,我们仍须勇于希望。在一个充满愤怒的世界,我们仍须勇于安慰。在一个充满绝望的世界,我们仍须勇于梦想。在一个充满猜忌的世界,我们仍须勇于相信。