Chris Rock, in his unique blend of wisdom, riffs on the difference between having a job and having a career:
He seems to define a job as something you hate and a career as something you love. I'm not sure that's the most useful distinction and definition. But, I love Rock's point that loving what you do causes you to always think there's not enough hours in the day. And his story about dropping out of the tenth grade and how he should have just dropped out of the second grade, while exaggerated, is perversely true.
(hat tip: Marci Alboher)