To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

In mathematics, the journey of discovery is as important as the destination.

人性这根曲木，决然造不出任何笔直的东西。

人は、失敗から学ぶものだ。