1 Corinthians 2:1-5

And I, brethren, when I came unto you, came not with excellency of speech or of wisdom, proclaiming to you the testimony of God. For I determined not to know anything among you, save Jesus Christ, and him crucified. And I was with you in weakness, and in fear, and in much trembling. And my speech and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power: that your faith should not stand in the wisdom of men, but in the power of God.