Earlier quoted context omitted.
Bach was deeply religious, and not just because of some lap-dog sense of "that's who's paying the bills." He signed most of his works as "SDG", short for "Soli Deo Gloria", which roughly translates as "to God alone belongs all glory. His meaning being that any ability Bach thought he had was solely just God showing off: Bach made beautiful music, but God made Bach, and he knew it.
That is a great quote. I used it in the dedication section of a book I wrote recently. Bach is fascinating on many levels - lots of C.S. types quickly appreciate the structure/counterpoint in all of his instrumental music. But because so much of his music was written for a worship context, a whole additional dimension can be seen where he uses musical devices to comment on or support words being sung.
What on Earth does that mean?