The past is always with us, for it feeds the present.
饥饿的时候就不惜妄取以保存性命,吃得很饱的时候又用虚伪的行为来粉饰自己。 
We are all self-righteous hypocrites.
你应该问的问题不是“我想要什么?”或“我的目标是什么?”,而是“什么会让我兴奋?”
Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.