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 old believe everything, the middle aged suspect everything, the young know everything.

We change our behavior when the pain of staying the same becomes greater than the pain of changing.

Success does not consist in never making mistakes but in never making the same one a second time.