真相是，我们都有能力做出极大的恶和极大的善。是我们做出的选择定义了我们。

学习数学的唯一方法就是做数学。

We don't even know how strong we are until we are forced to bring that hidden strength forward. In times of tragedy, of war, of necessity, people do amazing things. The human capacity for survival and renewal is awesome.

The soil is not just dirt—it's the foundation of civilization.

思想是句子的意义。