Though love seems the fastest of all growths, it is really the slowest. No man or woman knows what perfect love is, until they have been married a quarter of a century.

在每一本书中，都有作者灵魂的一部分。

A good book is a conversation between the author and the reader.

The key to artificial intelligence has always been the representation.

安全必须始终是我们所做一切的首要任务。

城市的穷人就像树的根；看不见，但对它的生命至关重要。

一个命题的证明是一种性质使得我们相信该命题的过程。