"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

衡量一本好书的标准是它是否能让你以不同的方式看待世界。

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.