1 Corinthians 1:17, 21
1 Corinthians 1:17 KJV
For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.
1 Corinthians 1:21 KJV
For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.