1 Corinthians 2:2-5

2:2 For I decided to be concerned about nothing among you except Jesus Christ, and him crucified. 2:3 And I was with you in weakness and in fear and with much trembling. 2:4 My conversation and my preaching were not with persuasive words of wisdom, but with a demonstration of the Spirit and of power, 2:5 so that your faith would not be based on human wisdom but on the power of God.