The Trigger of the Spirit
The Spirit of God who indwells the preacher is the most powerful force in the universe. And God has ordained a system in His Trinitarian economy that provides every safety mechanism necessary to prevent us from accidentally hurting ourselves or someone else with His Spirit, but at the same time enables us to engage His Spirit in our work whenever we are ready to fire. He’s done this by ordaining prayer to be the primary way we engage His Spirit in the Christian life and work, including our preaching.