这个世界会打击每一个人，但经历过后，许多人会在受伤的地方变得更坚强。

写作是一种见证世界的方式。

The beauty of mathematics only shows itself to more patient followers.

A man is rich in proportion to the number of things which he can afford to let alone. That man is the richest whose pleasures are the cheapest.

在数学中，你并不理解事物。你只是习惯了它们。

Change is good. Change is progress. Without change, nothing would ever improve.