Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.
Excellence is not an act, but a habit.
积极的情绪拓宽了我们的意识，让我们看到更多的可能性。
The work of art is a fragment of the cosmos.
You can’t be afraid to fail. It’s the only way you succeed.
对来自学生的批评应该本着友好的精神来接受，学习材料的积累不应该扼杀学生的独立性。
A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.