Piper on Desires

John Piper, in When I Don't Desire God, writes of the importance of fighting for joy:

"God is glorified in his people by the way we experience him, not merely by the way we think about him. Indeed the devil thinks more true thoughts about God in one day than a saint does in a lifetime, and God is not honored by it. The problem with the devil is not his theology, but his desires."

If you've read much Piper, you know how vitally important it is to him that we think properly about God and understand the marvelous depths of truth about Him and in Him. Yet if that's as far as we go, then we haven't really understood. Does your theology and understanding lead to greater desire for God? Is your faith limited to thinking, or does it go beyond that?