1 Corinthians 1:21 Meaning

19For it is written, I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent.

20Where is the wise? where is the scribe? where is the disputer of this world? hath not God made foolish the wisdom of this world?

21For 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.

22For the Jews require a sign, and the Greeks seek after wisdom:

23But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;