The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.

静坐的时候才知道平日的心浮气躁，独自呆着不说话才知道平日言语暴躁多话。反省行为才知道平日心情忙乱，闭门拒绝客友才知平日交友泛滥。少欲望才知道平日多病。近人情才知道平日待人处事的苛刻。

理论计算机科学不仅仅是解决问题；它是关于理解计算本身的本质。

The most effective way to destroy people is to deny and obliterate their own understanding of their history.