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.

Stay focused, stay humble, and always keep learning.

所有人都存在危险。自由政府的唯一准则应该是不要信任任何拥有权力的人，以免危及公共自由。

要知道产生药物的根源之处，只在西南方向是根本所在。

生命是一场漫长的告别。

Happiness lies in the joy of achievement and the thrill of creative effort.