For the Christian, reading the Bible is internally transformative.
OK, even though the bible doesn't interest me, we once went through the score of the Fantasia Apocalyptica together and it was useful that I knew enough of the bible to discuss some references. There are also musical "puzzles" or clues in the score a few of which I was lucky enough to catch so I didn't come off as a complete dufus.
Highly recommended. Also, "3:16".
These are about the operating system of the soul.