Boast not against the branches. But if you boast, you bear not the root, but the root you.
Read Chapter 11
Ambrosiaster
AD 400
It displeases God if someone rejoices at the misfortune of others, as Solomon says. In any case, the Jews were not rejected for the sake of the Gentiles. Rather, it was because they were rejected that they gave an opportunity for the gospel to be preached to the Gentiles. If you boast against those onto whose root you have been grafted, you insult the people who have accepted you so that you might be converted from bad to good. You will not continue like that if you destroy the thing on which you stand. Commentary on Paul’s Epistles.
Whenever I see a synagogue, the thought of the apostle always comes to me—that we should not boast against the olive tree whose branches have been broken off but rather fear. For if the natural branches have been cut off, how much more we who have been grafted on the wild olive should fear, lest we become like them.
