discipline...

Stan: Dad, you like to drink, so have a drink once in a while. Have two! If you devote your whole life to completely avoiding something you like, then that thing still controls your life and... and you've never learned any discipline at all.
Randy: But, maybe I'm just the kind of person who needs to have it all or nothing.
Stan: No. All or nothing is easy. But learning to drink a little bit, responsibly? That's a-disiprin. Disiprin come from within.
Randy: How did I manage to raise such a smart kid?
Stan: I've had a great teacher.
Randy: Thanks, son.
Stan: No, not you. My karate teacher. He's really smart.