Take that Keutzer sonata for instance, ............ Such thing should only be played on certain important significant occasions, and then only when certain actions answering to such music are wanted; play it then and do what the music has moved you to. Otherwise an awakening of energy and feeling unsuited both to the time and the place, to which no outlet is given, cannot but act harmfully. At any rate that piece had a terrible effect on me, it was as if quite new feelings, new possibilities of which I had till then been unaware, had been revealed to me. " That is how it is: not at all as I used to think and live, but that way," something seemed to say within me. What this new thing was that had been revealed to me I could not explain to myself, but the consciousness of the new condition was very joyous.
Leo Tolstoy The Kreutzer Sonata