美德不在于避免恶习，而在于不渴望它。
Virtue consists， not in abstaining from vice， but in not desiring it.
I write to understand what I think.
有趣的是，对你来说最重要的事情往往最难开口。
The psychologist must study the mind as it is, not as it ought to be.
The process of doing mathematics is more important than the result.
No great artist ever sees things as they really are ,If he did he would cease to be a artist.
我不会让过去拖累我，我会让它推动我前进。