Choose rather to be strong of soul than strong of body.
The true meaning of life is to plant trees, under whose shade you do not expect to sit.
Quality should never be compromised for the sake of quantity.
History is the art of making the dead speak.
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 limit to our realization of tomorrow will be our doubts of today.