Dizzy talks about it in terms of elimination and mood. I would extend it to immediately knowing that what you are hearing is on a high musical and artistic level as well as realizing it's other attributes and, most essentially, whether you like it or not. After that it's in everyone else's hands or ears, as the case may be. Communication is so very vital to any art form and not just for the reason of making a living. It comes back to a tree crashing in a forest.
Much great jazz is played by musicians for themselves and each other.
That's a great starting point, but hardly the end goal. John Coltrane used to talk about imagining his music reaching out and embracing his audiences, which he obviously accomplished. In my opinion, chord changes are stressed too heavily to the aspiring student. They are merely signposts for a melodic line. Dizzy suggests going to the piano, which the great majority of jazz musicians do.