For the gifts and calling of God are unchangeable.
All Commentaries on Romans 11:29 Go To Romans 11
Ambrosiaster
AD 400
It is usually thought that those who have sinned badly by not accepting the promise of God cannot receive mercy if they do not demonstrate their sorrow, because those who have sinned badly cannot be forgiven without tears and wailing. But Paul shows that these things are not required at the start, because God’s gift freely pardons sins in baptism. Commentary on Paul’s Epistles.