Sounds to me like he's worried about you quitting more than anything else (possibly he recognizes that you've been frustrated with your progress lately). Seems to me he sees positive changes in you from the training and is legitimately worried that you'll quit and go back to doing "nothing" with your free time, as too many adults do, and not continuing to better yourself through martial arts or another means. Sounds like he cares about you and your well being and personal growth. I like this explanation better...I'm going to ask him on Monday...I'd never quit karate...I know I don't show it sometimes but I do love the martial arts...I cannot explain it...I probably shouldn't but i'd only leave if Sensei told me too.