Mathematics is a conversation between the past and the future.

羞耻的基础不是我们的个人错误，而是我们必须成为别人希望我们成为的那种人的耻辱和屈辱。

The so-called understanding is often just a misunderstanding that is widely circulated.

Between stimulus and response there is a space. In that space is our power to choose our response. In our response lies our growth and our freedom.

"We are all the same, but we are all different."

The best mathematics is simple, but not too simple.

解释：屋顶是否有漏洞，下面的人才知道。