数学的语言是普遍的，超越了文化和语言的障碍。

没事要戒掉一个“偷”字，有事要戒掉一个“乱”字。

I always try to be positive, to fight until the end, to keep running, to keep fighting.

Every portrait that is painted with feeling is a portrait of the artist, not of the sitter.

解释：对社会有用的，创作百篇也没有害处；对社会无用的，写一章也没有好处。