The challenges in our lives are there to strengthen our convictions. They are not there to run us over.

The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.

Art is the wound where light enters.

创新不仅仅是创造新事物；而是让现有的变得更好。

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。