In the matter of practice, I never urge a student to work so many hours a day. One may be enough. The musician is like a painter, who frequently spends his time in looking at the work he has done, and in thinking what he will make of it, without so much as touching the easel.
— Theodor Leschetizky
S. Hough, Rough Ideas: Reflections on Music and More, London, Faber & Faber, 2019, p. 137.