The difference between a dream and reality is action.
专制制度就像地狱一样,并不容易战胜,但我们可以安慰的是:斗争越艰巨,胜利将越光荣。
I think that the thing that makes mathematics worthwhile is the fact that it has this incredible structure that you can explore and discover.
我们不能改变过去,但我们可以改变对过去的看法。