Good artists hustle. They stretch their limits of imagination. They welcome discomfort. The others are busy drawing more sea-shells and palm trees.
Good musicians work two jobs so they can play their own music at gigs. Gigs are tough. Gigs need you to hustle. The others are pretty happy with their status quo in their coffee-house style playing covers.
A monk hustles. Zen is tough. "Don't-know mind" does not come easy. Meditation is really hard. They put in the time and the effort where others give up and quit.
Hugh MacLeod hustled when everyone told him it was worthless to do so.
"If your plan depends on you suddenly being "discovered" by some big shot, your plan will probably fail. Nobody suddenly discovers anything. Things are made slowly and in pain." -- Hugh MacLeod, Ignore Everybody
Hustle is a good marker of people I want to be around. These people say "What if" when they can say, "Will do." They are not happy with good. They seek better. Not more, but better. And they want to find better themselves.
Casey Neistat says this in his own way in the video below.