【大意】古来圣哲不珍视直径成尺的璧玉，却珍重每一寸光阴，因为时间最是难得，却最容易失去。

密码学的本质是允许在存在对手的情况下进行通信。

I'm not bossy. I'm the boss.

我喜欢掌控自己的命运。

I have great faith in fools; self-confidence my friends call it.

The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.