"What then are we to do about this? There is only one obvious conclusion. Seek him! What can we do without him? Seek him! Seek him always. But go beyond seeking him; expect him. Do you expect anything to happen when you get up to preach in a pulpit? Or do you just say to yourself, 'Well, I have prepared my address, I am going to give them this address; some of them will appreciate it and some will not'? Are you expecting it to be the turning point in someone's life? Are you expecting anyone to have a climactic experience? That is what preaching is meant to do. That is what you find in the Bible and in the subsequent history of the Church. Seek this power, expect this power, yearn for this power; and when the power comes, yield to him. Do not resist. Forget all about your sermon if necessary. Let him loose you, let him manifest his power in you and through you."
D. Martyn Lloyd-Jones, Preaching and Preachers, page 325.