历史是一个庞大的预警系统。

What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.

自守表示的研究是数学知识统一性的反映。

一个设计良好的系统是能够随着时间的推移而发展，而不需要大量的返工。