Personal testimony is sometimes interesting, perhaps amazing, but it isn't the power of God to save the lost. That's the King James. It matters not what else a preacher has to offer, education, charisma, wisdom, wit, he does not, indeed he can not fulfill his divinely given charge or ministry without preaching the word of God. Because it is inspired of God and is useful for teaching, for reproof, for correction, for instruction in ridhteousness, and it adequately supplies him to everything he needs to be doing. It is adequate to the needs of all.
Creation is a picture book for children.
But for God to speak in the language of mortal men is still more marvelous, if you come to think of it. I wonder that He should have written down His word in black and white, in unmistakable language that can be translated into all tongues so that we may all see and read for ourselves what God the Lord has spoken to us and what, indeed, He continues to speak. For what He has spoken He still speaks to us as freshly as if He spoke for the first time. And He's said all He has to say. He kept back nothing.