The loneliest moment in someone's life is when they are watching their whole world fall apart, and all they can do is stare blankly.

I like things that are simple and easy to understand.

"Courage is not the absence of fear, but the triumph over it."

When each day is the same as the next, it's because people fail to recognize the good things that happen in their lives every day that the sun rises.

纯数学和应用数学之间的相互作用是真正创新发生的地方。