If true religious affections are produced only through the Spirit, and of course "the Spirit cannot be manipulated," then what is the role of the music? Can we "set the mood?" Can we implement variety within a series of songs to attempt to produce an emotional response? What then is the end of our service planning? Why do we practice crescendos and sudden pianos in our worship songs? Or is it right that there should be no guarantee of proper emotional response, without the work of the Spirit, who is beyond our control?