If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
不要追问这世界需要什么样的人，扪心自问是什么支持着你活到现在，然后奔赴你的信仰、因为这世界需要的就是人们充满活力地活在世上。
The most important skill in mathematics is the ability to ask the right questions.
All great art and literature is propaganda.
"A good sentence is a small miracle."