"Imagine a whole lifetime of this struggle, movement after movement, symphony after symphony, sonata after quartet after concerto. Always probing and rejecting in this dedication to perfection, to the principle of inevitability. This somehow is the key to the mystery of a great artist: that for reasons unknown to him or to anyone else, he will give away his energies and his life just to make sure that one note follows another inevitably. It seems rather an odd way to spend one’s life; but it isn’t so odd when we think that the composer, by doing this, leaves us at the finish with the feeling that something is right in the world, that something checks throughout, something that follows its own laws consistently, something we can trust, that will never let us down."
- Leonard Bernstein