坚持非常重要。你不应该放弃，除非你被迫放弃。

Writing is like sex. First you do it for love, then you do it for your friends, and then you do it for money.

"The world is full of stories, but the ones that matter most are the ones we tell ourselves."

坚持是数学研究的关键，许多伟大的成果来自于长期的奋斗。