"Just wanted to drop you a quick note
to let you know that I really enjoyed your course. Thanks for your patience. You are a great teacher. I have found in the past that just because one has the knowledge on something, doesn't mean they have the ability to convey that information to others in a way they can retain it. You actually have the gift. I know I retained more that I thought I would. It was a pleasure spending those three days under your guidance."