We say of some things that they can't be forgiven, or that we will never forgive ourselves. But we do—we do it all the time.
你不能信任你没有完全自己编写的代码。
The only person you should try to be better than is the person you were yesterday.
We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.