清洁：身体、衣服及住所，力求整洁。

The world is a place of the living, and the dead have no place in it. The dead are nothing. They are not even a memory. They are forgotten.

数学的历史是人类思想和进步的历史。

Sometimes the only way to survive is to become someone else.

成功不是终点，失败也不是致命的：重要的是继续前进的勇气。