"Woe to us if we do our exposition of such a gospel without exultation—that is, without exulting over the truth we unfold. When Paul says in 2 Corinthians 4:5, “For what we proclaim is not ourselves, but Jesus Christ as Lord,” the word he uses for “proclaim” is kerussomen—we herald Christ as Lord, we announce Christ as Lord. The kerux—the proclaimer, the “preacher”...may have to explain what he is saying if people don’t understand (so teaching may be involved). But what sets the herald apart from the philosopher and scribe and teacher is that he is the herald of news—and in our case, infinitely good news. Infinitely valuable news. The greatest news in all the world.Why expositional preaching is particularly glorifying to God - John Piper at Together for the Gospel 2006
The creator of the universe, who is more glorious and more to be desired than any treasure on earth, has revealed himself in Jesus Christ to be known and enjoyed forever by anyone in the world who will lay down the arms of rebellion, receive his blood-bought amnesty, and embrace his Son as Savior, Lord, and Treasure of their lives.
O brothers, do not lie about the value of the gospel by the dullness of your demeanor. Exposition of the most glorious reality is a glorious reality. If it is not expository exultation—authentic from the heart—something false is being said about the value of the gospel. Don’t say by your face or by your voice or by your life that the gospel is not the gospel of the all-satisfying glory of Christ. It is. And may God raise up from among you a generation of preachers whose exposition is worthy of the truth of God and whose exultation is worthy of the glory of God."