Have you ever reached a point in learning something where you see that it can never be fully learned?

I’ve arrived in an interesting place in my guitar learning… I’m learning many skills from someone that I can only describe as a master guitarist who has learned from other master guitarists around the world. I realize that I’d be considered an amazing guitarist by a 10 years younger me, or to a layman. But I also see what is still ahead of me and that I could play every day for the rest of my life and still never know it all. Similarly, my teacher could say the same thing, even though he’s leagues ahead of me in terms of skill. Have you encountered this as you strive to master a skill – that at least in your own mind, you can never truly be a master?