Sometimes the right path is not the easiest one.
有时候正确的道路并不是最容易的那条。
The best way to predict the future is to invent it.
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.