智力是当你不确定该做什么时所使用的东西。
Intelligence is what you use when you don't know what to do.
Psychological truth is what stands the test of life.
价格会被遗忘，但品质会被长久铭记。
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.
The best characters are the ones that stay with you long after the book is closed.
试图在不激发学生学习欲望的情况下进行教学的老师，就像在冷铁上敲打。
False happiness renders men stern and proud， and that happiness is never communicated. True happiness renders them kind and sensible， and that happiness is always shared.
