"That's the essence of preaching (Jer 2:13). The best way to glorify an
inexhaustible fountain is to keep on drinking and to keep on being so satisfied with that fountain that nothing can draw you away. Therefore the task of preaching is to display the all-satisfying glories of God in such a way that the power of all competing pleasures is broken and God Himself holds people captive".
John Piper - "Preaching as Worship: Meditations on Expository Exultation" - Trinity Evangelical Divinity Journal - 16NS (1995) 29-45