On the efficacy of preaching, Michael Horton insists “It is effective because God has promised to dispense his saving grace then and there by the Spirit, and it grows organically out of the logic of the message itself because it is an announcement of something that has been accomplished by God, rather than an incentive to get sinners to save themselves by sheer force of will or effort. It is good news, not good advice, good production value, or good ideas.”
Horton elaborates on this good news: “. . . we can always count on God being where he has promised to meet us . . . . The power of the Spirit is linked to a promise; namely, a promise that faith comes by hearing the gospel preached (Rom. 10:8, 17)” (A Better Way: Rediscovering the Drama of God-Centered Worship, 64-65).