One of my favorite things about teaching knitting classes is that moment when a student's eyes light up because something I just taught them has advanced their understanding of our craft. Its happened many times and I never tire of it! It comes into existence at that intersection of skill building and when the Knitter is ready to absorb the next building block of knitting knowledge.
One of my cherished memories is of a relatively novice Knitter who I was teaching how to knit "backwards" (left to right as opposed to right to left). Less experienced Knitters pick this skill up faster as their muscle memory isn't as firmly ingrained. She looked up at me and said "I'm never going to purl again" in a totally deadpan voice.