who in time past were no people, but now are God's people, who had not obtained mercy, but now have obtained mercy.
Paul speaks of Christ crucified, to the Jews foolishness -- I mean to the Greeks foolishness, but to the Jews an offence; "but unto us which are saved the power of God" ( 1 Corinthians 1:18 ). And so he is a "rock of offence even to them which stumble."