我们对明天的唯一限制是我们今天的疑虑。
"The only limit to our realization of tomorrow is our doubts of today."
The most important thing in mathematics is to have a good intuition.
Making something is really hard. You have to care about it so much that you will push through all the disappointments and frustrations.
Number is the ruler of forms and ideas， and the cause of gods and daemons.
用程序证明四色定理不会改变数学——它只是证明了这个挑战了一个世纪的定理是一个有限的问题。