廉者，政之本也；谦者，德之主也。
晏子春秋
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
理论计算机科学不仅仅是解决问题，更是理解计算本身的本质。
Logic is one thing and common sense another.