Since the world in all its fancy wisdom never had a clue when it came to knowing God, God in his wisdom took delight in using what the world considered dumb - preaching, of all things! - to bring those who trust him into the way of salvation.
While Jews clamor for miraculous demonstrations and Greeks go in for philosophical wisdom,
we go right on proclaiming Christ, the Crucified. Jews treat this like an anti-miracle - and Greeks pass it off as absurd.
But to us who are personally called by God himself - both Jews and Greeks - Christ is God's ultimate miracle and wisdom all wrapped up in one.