Aristotle on Learning by Doing

“It was not by seeing frequently or hearing frequently that we acquired the senses of seeing or hearing; on the contrary, it was because we possessed the senses that we made use of them, not by making use of them that we obtained them. But the virtues we acquire by first exercising them, as is the case with all the arts, for it is by doing what we ought to do when we have learnt the arts that we learn the arts themselves; we become builders by building and harpists by playing the harp.”