一个人若不付出一些无知的代价，就永远不会幸福。

We have forty million reasons for failure, but not a single excuse.

What matters in life is not what happens to you but what you remember and how you remember it.

贤能的人做事，考虑的是如何有利于他人

Mathematics is a conversation between the past and the future.

未来是创造一个更可持续的世界。