Theodoret of Cyrus — on Rom 11:15 (INTERPRETATION OF THE LETTER TO THE ROMANS)

“Note how diplomatically Paul phrases his statements. On the one hand he teaches those who already believe not to think too highly of themselves, and on the other hand he extends a hand to those Jews who do not believe, showing them that they could obtain salvation through repentance. In the following [verses] he develops this theme more clearly.”