I was blown away at the time by what was possible and that, even though he was very old at the time and had to be led out onstage by the arm, needed help getting seated, and had the guitar placed in his lap, what he could still play was so far advanced of anyone in my class who were all in attendance.
The temptation (and I have felt this many times since then after hearing various guitarists) could have been "I should just quit now because I'll never be that good." But I'm glad I didn't succumb to that and decided that "I'd rather not sound like anyone else" and still feeling pleasure and accomplishment from playing on my own terms.