安全总是过度的，直到它不够为止。

There are some things one remembers even though they may never have happened.

The power of abstraction allows us to see the common threads that run through seemingly disparate problems.

平静来自内心。不要向外寻求。

每一本书都是一扇通往未知世界的门，一次探索未知的邀请。