A master martial artist asked Bruce Lee to teach him everything Bruce knew about martial arts. Bruce held up two cups, both filled with liquid.
“The first cup,” said Bruce, “represents all of your knowledge about martial arts. The second cup represents all of my knowledge about martial arts. If you want to fill your cup with my knowledge, you must first empty your cup of your knowledge.”
Or as Yoda would say: “Unlearning nonsense is as valuable as learning the truth…”