The power of mathematics lies in its ability to abstract and generalize.

我不相信贫穷，我相信创造机会。

I have made a ceaseless effort not to ridicule， not to bewail， not to scorn human actions， but to understand them.

我们不是在说教，我们只是想传授。

当下总是看不见的，因为它是环境，而我们是鱼。