To write is to give voice to the voiceless.

"Education never ends, Watson. It is a series of lessons, with the greatest for the last."

晏子春秋

数学家研究纯数学不是因为它有用；他研究它是因为他喜欢它，他喜欢它是因为它美丽。

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.

你无法取悦所有人，所以不要尝试。