1 Corinthians 2:1-6

So I never thought in coming amongst you to be able by my own persuasiveness, logic or rhetoric to make a message of God, a revelation of the mystery of His being, understood by you. It could never have come to you through such human means as that. And so I judged that to know nought but Jesus Christ and him crucified was the way, the only way of this Gospel, which is demonstrated divinely by the Spirit and by power, not by persuasive preaching. I was as nothing in myself, only conscious of my weakness, and full of deep reverence and fear, yes, even of what I had to say, which could not express itself in clever words; and so your faith was built not on any man’s personal influence and wisdom, but on divine power and its demonstration. Yet it is a wisdom that I speak, a deep and holy wisdom known to the perfect, unknown to the passing world of the flesh, and unknown to the powers that control that world, powers and influences which even now, are breaking up and vanishing.