山溪里的水随着季节常涨常退，不明事理的小人反复无常。

Architecture is a battle against gravity.

I'm just a woman. And as a woman， I have no way to make money， not enough to earn a living and support my family. Even if I had my own money， which I don’t， it would belong to my husband the minute we were married. If we had children they would belong to him， not me. They would be his property. So don’t sit there and tell me that marriage isn’t an economic proposition， because it is.

Cryptography is about communication in the presence of adversaries.

Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.