In spite of the fact that this is merely a childish fancy, there is a particle of truth in it and I only mentioned it because now, with my tremendous teaching experience, I know too well how often even talented pupils, able to cope with their task, fail to realize with what tremendous manifestation of the human spirit they are dealing. Obviously this does not make for an artistic performance; in the best of cases they stagnate at the level of good workmanship.

The Art of Piano Playing (1958), In Lieu of a Preface