Freeing the Spirit

In reading Joe Horness' portion of the chapter, I noticed that he repeatedly talked about how when we worship correctly, we are "setting the Spirit free" to work within us and change us. I was wondering if anyone knew what he meant by this--it kind of confused me. It seemed like he was very consumed with what we bring to worship. It was all about what we can offer to God while we're participating. Maybe this is sort of what he's referring to in saying that the Spirit is freed by our worship?