1 Corinthians 1:18, 21, 23

For the word of the cross is to them that perish foolishness; but unto us who are saved it is the power of God.

For seeing that in the wisdom of God the world through its wisdom knew not God, it was God’s good pleasure through the foolishness of the preaching to save them that believe.

but we preach Christ crucified, unto Jews a stumblingblock, and unto Gentiles foolishness