"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding."

You have to believe in yourself when no one else does.

释义：有了过错却不知道的人是被蒙蔽，迷失了方向还不返回的人是迷惑。这是对自知之明与迷途知返重要性的阐述。

做正确的事永远是时候。