一个良好的世界需要知识、善良和勇气；它不需要对过去的后悔，也不需要被无知之人长时间前说过的话所束缚的自由智慧。

"To write is to breathe, to live, to exist in a world of one's own creation."

Combinatorics is like the art of counting without actually counting.

The artist must be in his work as God is in creation, invisible and all-powerful.

计算复杂性的研究不仅仅是关于解决问题，还在于理解可计算性的极限。

The only way to achieve long-term success is to create real value in society.