Well, the first rule is that you can’t really know anything if you just remember isolated facts and try and bang ’em back. If the facts don’t hang together on a latticework of theory, you don’t have them in a usable form.

Truth and clarity are complementary.

时间是一条既向前流又向后流的河流。

理论计算机科学是一个领域，其中深刻的数学见解导致了实用的计算工具。