Lisp is worth learning for the profound enlightenment experience you will have when you finally get it; that experience will make you a better programmer for the rest of your days, even if you never actually use Lisp itself a lot.

The deep, personal material of the latter half of your life is your children. You can write about your parents when they're gone, but your children are still going to be here, and you're going to want them to come and visit you in the nursing home.

艺术中没有“太多”，只有“不够”。

Every mathematical problem is a window into a deeper understanding of the world.

我们需要创造性地思考如何解决世界上最大的问题。