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.

商业的本质是解决问题，而不是制造问题。

外交家应该具备灵活性和适应性，以应对快速变化的国际环境。