1 Corinthians 2:1-5

2 And when I came to you, brethren, I did not come with superiority of speech or of wisdom, proclaiming to you the testimony of God. 2 For I determined to know nothing among you except Jesus Christ, and Him crucified. 3 I was with you in weakness and in fear and in much trembling, 4 and my message and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power, 5 so that your faith would not rest on the wisdom of men, but on the power of God.