Two pursuits require constant practice, three never rest: Flying airplanes in the bush, playing musical instruments for an audience, and walking with God.
Remembering that final airspeed varies between 55 and 60 knots, depending upon gross aircraft weight, is not the same thing as recognizing the edge of ‘the settle’ while playing the throttle on a bumpy approach. Reaction trails need, and wheels touch only in the general vicinity of the target spot. Amateur hides professional.
Remembering Beethoven’s “Fur Elise” is not the same thing as producing a smooth parade of notes up and down the keyboard. Nervous fingers hesitate, forgetting their path. They arrive only more or less on time. Parody eclipses masterpiece.