释义：世上的许多人为了利益，不惜冒生命危险，甚至到了无路可退的地步也不愿放弃。

认知指的是所有感官输入被转换、简化、详细阐述、存储、恢复和使用的过程。

If a doctrine is not unintelligible, it has to be vague; and if neither unintelligible nor vague, it has to be unverifiable.

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.