Money is concerned only with what is common to all: it asks for the exchange value, it reduces all quality and individuality to the question: How much?
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.
我总是告诉我的孩子们,‘如果你要做某件事,就要做好。如果你不打算做好,那就干脆别做。’