自由不是恩赐，而是必须争取的权利。
To write is to breathe, to live, to exist beyond the confines of time.
To be a good mathematician, you need to have both intuition and rigor.
我独处时从来不感到厌烦，闲聊才是我一辈子忍受不了的事情。
一本好书是作者与读者之间的对话。