We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.

We usually see only the things we are looking for- so much so that we sometimes see them where they are not.

对于劳动者来说，最大的幸福是有充足的物质享受。

世界上充满了显而易见的事物，却没有人注意到。

在自然界中，没有什么是孤立存在的。