不要害怕失败，要害怕不去尝试。
I'm not perfect but I'm trying
The theory of computation is not just about solving problems, but also about understanding the limits of what can be computed.
You get what you give. What you put into things is what you get out of them.
The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
——《致鲁赛尔函》（1906年11月8日）