This from John Piper:
“God exists to be worshipped—to be admired and treasured and desired and praised. Therefore, the Word of God is written primarily to produce worship. This means that if that Word is handled like a hot-dish recipe or a repair manual, it is mishandled. And the people will suffer. The Truth of God begs to be handled with exultation. And our hearts yearn for this and need it. Something in us starts to die when precious and infinitely valuable realities are handled without feelings and words of wonder and exultation. That is, a church starts to die without preaching.
But, of course, this assumes something massive. To treasure the Truth, and to love the Truth, and be impassioned about the Truth, and to exult in the Truth, you have to know the Truth. So it’s not enough to say that preaching is exultation. We must also say it is “expository exultation.” It is exultation in the Truth of God’s Word. And the exultation is in proportion to the Truth delivered.”