In one of the synods of the Evangelical Church in Germany a young minister testified that he never prepared his sermons, but trusted the Spirit to put the right words into his mouth. When the turn came for an older man to speak, he said, ‘We heard our young brother say that he did not need to prepare his sermons because the Holy Ghost would speak to him and tell him what to say. As for me, the Holy Ghost never spoke to me in the pulpit. Yes, I remember, he did speak to me once. When I was going down the pulpit steps after a poor sort of sermon, the Holy Ghost spoke to me. He said only three words, and what he said was, “Heinrich, you’re lazy.”’”
Gibson, Scott M. (2012-03-01). Preaching with a Plan: Sermon Strategies for Growing Mature Believers (p. 43).