真相并不总是我们想听的，但它是我们需要知道的。

The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.

Sometimes the things that are most real are the things you can't see.

It is the client who knows what hurts, what directions to go, what problems are crucial, what experiences have been deeply buried.

出自晋·葛洪《抱朴子·应嘲》。虽说昆山的玉石很多，但不能救济原宪的贫穷。喻指毫无价值的空话。