As Lincoln got on the train that would take him to Washington, he said: "I now leave, not knowing when -- or whether ever I may return.

VOA: special.2009.07.23

Important lesson, so that there would be some predictability in the results and I would have some, if you will, smoke test for knowing whether or not I was getting, my code seemed to be working.

这很重要，因为这样我就可以预测,结果会是多少了，如果你愿意，我们可以做烟气试验,来看我的代码是否工作正常。

麻省理工公开课 - 计算机科学及编程导论课程节选

If it were all the things that it's not, or if it were identical to all the things that somehow or another it's not, then I would be in a very difficult situation because I wouldn't have any means of knowing it in particular.

如果一件事就是它自身的反面，或者和其他的事物没有区分之处,那么我们，就很难认识它,因为我们没有办法认识它。

耶鲁公开课 - 文学理论导论课程节选

- After all, if you knew-- suppose we had the birthmarks that told you -- when you were going to die-- if you had that kind of a birthmark, you would face your entire life with the burden of knowing, I've got 48 years left, 47 years left, 50 years left.

毕竟，如果你知道-,假设我们有个胎记能告诉你,你什么时候去世-,如果你有那种胎记，你一辈子都将面对那种知情的压力，我还剩48年，还剩47年，还剩50年。

耶鲁公开课 - 死亡课程节选