Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.

I think that the role of the mathematician is to discover these patterns and to explain them.

过去是一个跟随我们的影子，一个困扰我们的幽灵。

一个试图教学而不激发学生学习欲望的教师，就像在冷铁上敲打。