Obviously all the "extracurricular" antics he does is not something one would teach in Sunday school.
It is the magic that he does on the court with racket in hand that is still amazingly beautiful to watch.
IMHO, the best "touch" and "artistry" in the history of the game. For the lack of muscle and power, he made up for with precision accuracy and placement.
As someone once said, "Tennis is simple, put the ball where he's not".