Single motion – that’s all.
Very little exertion and a quick result.
But if you move to the field where the brushes are, you have to cut the same grass at least 4 times, the top, a couple of times in the middle and one time close to the ground.
If you try to cut it with one sweep – the trimmer will twine with the grass and tangle up in the brushes. Moreover, if you want to cut sweet calamus which grows close to the wetlands, you may need to sweep even 8-10 times.
Practicing organ music often is the same as working with the trimmer. Shallow and straightforward pieces can often be played just once and that might be enough to play without mistakes.
By the way, in this case, because the music is shallow, playing it twice would be boring.
But if you are practicing an advanced and artistically valuable composition, playing it one time through will not be enough (in fact, playing it twice will not be enough, either).
It turns out that you have to give a complex piece a few more chances to sink into your memory, fingers and feet. Let it live with you for a while and play a few more times.
The more you play it, the more discoveries you will make.