Well; because of unbelief they were broken off, and you stand by faith. Be not arrogant, but fear:
Read Chapter 11
Ambrosiaster
AD 400
You ought to thank God for his gift in Christ and not insult them but rather pray that, if their wickedness has led to your salvation, they too might return to their roots. Then you will please God who has shown you mercy, for he called you so that by making them jealous of you he might bring them to grace as well. Commentary on Paul’s Epistles.
I hear that some are puffed up and are arrogant, although it is written, "Be not high-minded, but fear: for if God spared not the natural branches, take heed lest He also spare not thee.".
Of this same thing to the Romans: "Be not high-minded, but fear; for if God spared not the natural branches, (take heed) lest He also spare not thee."
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.
