I was reminded of a story a while back when a friend of ours was called an expert in their field. Whatever he was talking about at that time he stopped and refuted. Even going so far as to cancel a show interview because they wanted to advertise him as an expert.
His response – “No one is an expert, we are all learning, and we are all, always gaining experience.”
Useful advice when you think you are at the top of game, not realizing how much you still have left to learn.