As a disciple of Jesus, I want to be controlled by only one thing: The Spirit of God. The reality is that people (myself included) are often controlled by many things besides the Spirit. I usually think of myself as a person with very few vices, but the one thing that kept coming to mind as a vice was sugar.
Something was controlling me besides the Spirit. I am a slave to something, and that is inconsistent with my identity as a child of God.