我不认为每个人都应该成为数学家，但我确实相信许多学生没有给数学一个真正的机会。

The value of a psychological concept is in its life application.

The man who is fit to work at any particular trade is unable to understand the science of that trade without the help and guidance of those who are working with him or over him.

The beauty of language lies in its ability to convey the inexpressible.

The question is not whether the thing exists， but whether it has any essence which is capable of existence without us.

Mathematics is not a spectator sport.