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.

我们是梦想成真的活生生的证明。

We are all of us made by what we have lost as much as by what we have gained.

传统方法蕴含智慧，但可持续发展要求我们在必要时超越它们。