最佳的投资机会往往出现在别人恐惧的时候。
There is no such thing as failure. Failure is just life trying to move us in another direction.
我没有任何特别的秘诀（用于开发新的证明）……这就是为什么做研究既具有挑战性又具有吸引力的原因。这就像在丛林中迷路，试图利用你能收集到的所有知识来想出一些新的技巧，并且如果运气好的话，你可能会找到出路。
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.
——1963年6月25日在西德市政厅柏林墙前的演说
In science, the most dangerous phrase is 'We've always done it this way.'