I found this in "The Wordsworth Dictionary of Musical Quoatations", which I picked up at Chapters for 5 dollars (Canadian, so 42 cents US):

Musick is the thing of the world that I love most.
Samuel Pepys (1633-1703)
BTW - Mary in Kentucky, there was only one quote by Albert Schweitzer in this 400 page book, and it wasn't about Chopin.
Here's another one:
Minuentur atrae
Carmine curae
Dark worries will be lessened by song.
Horace

Cheers, Bardford