Well; because of unbelief they were broken off, and you stand by faith. Be not arrogant, but fear:
All Commentaries on Romans 11:20 Go To Romans 11
John Chrysostom
AD 407
It was not God who cut them off but rather they broke themselves off and fell…. You see what a great thing man’s free choice is, how great the working of the mind is. For none of these things is immutable, neither your good nor their evil.