释义：人才没有固定不变的价值，器物没有一成不变的用处。

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.

自愿行为是统觉的结果。

他们曾说这城市是天堂，但我发现它是地狱。

The only thing I know is that I paint because I need to, and I paint whatever passes through my head without any other consideration.

The idea of justice is not the same as the idea of law.