"Sometimes, you have to look back in order to understand the things that lie ahead."
数学的本质不是把简单的事情复杂化,而是把复杂的事情简单化。
I could easily forgive his pride, if he had not mortified mine.
Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen.
The only way to do great work is to love what you do.