1 Corinthians 1:21; 1 Corinthians 2:4; 1 Corinthians 15:14

21 For since in the wisdom of God the world through its wisdom did not come to know God, God was well-pleased through the foolishness of the message preached to save those who believe.

4 and my message and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power,

14 and if Christ has not been raised, then our preaching is vain, your faith also is vain.