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 only fence against the world is a thorough knowledge of it.

建筑应该讲述它的时间和地点，但渴望永恒。

卒：同“猝”，指突然事变。这两句大意是：心中没有预先考虑应对事变的方法，就不能应付突然变故。

Writing is a way of reclaiming the past.