Preaching to the heart addresses the understanding first, in order to instruct it; but in doing so it also reaches through the mind to inform, rebuke, and cleanse the conscience. It then touches the will in order to reform and transform life and equip the saints for the work of ministry (Ephesians 4:12).
In the last analysis, this is what preaching to the heart is intended to produce: inner prostration of the hearts of our listeners through a consciousness of the presence and the glory of God. This distinguishes authentic biblical, expository preaching from any cheap substitute for it; it marks the difference between preaching about the Word of God and preaching the Word of God. (Feed My Sheep, Don Kistler, Soli Deo Gloria Ministries, 2002)