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.

"Courage is not the absence of fear, but the triumph over it."

最大的自由是选择自己思想的自由。

Collaboration is key—no great business succeeds alone.

一个好的侦探既听噪音，也听沉默。

"A book is a fragile creature, it suffers the wear of time, it fears rodents, the elements and clumsy hands. So the librarian protects the books not only against mankind but also against nature and devotes his life to this war with the forces of oblivion."