我们独处时的自己与在他人面前时从不一样。即使在黑暗中，我们也是不同的。
We are never the same with others as when we are alone. We are different, even when we are in the dark.
Understanding the limits of computation is as important as understanding its possibilities.
做出伟大工作的唯一途径是热爱你所做的事情。
The only limit to our realization of tomorrow will be our doubts of today.
——杜先生晚年在香港，先生为中国抗战.赈灾慈善做出巨大贡献，晚年依旧气度过人，毁掉所有欠条。
Writing is making sense of life. You work your whole life and perhaps you've made sense of one small area.