Sometimes the hardest thing and the right thing are the same.
有时候最难的事和最正确的事是同一件事
Absolute faith corrupts as absolutely as absolute power.
真相总是由两个半真半假的东西组成。
The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.
学习之道,没有什么比能够弄清事物的始末,来龙去脉更重要的。