数学的美在于它能够将复杂的思想简化为优雅的结构。

出自《论语·公冶长》。做事情，一定要通过反复的思考，再去行动。

To understand the world, you must first understand a place like Mississippi.

I think of a hero as someone who understands the degree of responsibility that comes with his freedom.

"Your most unhappy customers are your greatest source of learning."