40%的解决方案：提升幸福的能力在我们的个人掌控之中。

The relation between what we see and what we know is never settled.

We are all just passing through, and the world is indifferent to our passing.

唯一存在的限制是你自己设定的。

数学中的每个问题都有解决方案；你只需要找到正确的路径。