Cambridge Greek Testament Commentary
Romans 11 - Introduction
11. GOD has still not rejected Israel. (1) A remnant is saved now as in the time of Elijah, (8) the hardening of the rest has for its object the salvation of the Gentiles and ultimately of Israel itself. (15) The privilege of the Gentiles is the same as the privilege of Israel; (17) in their case also it may be forfeited, (25) and even for Israel it points beyond the time of hardening to their ultimate salvation. (29) For the gifts of GOD are irreversible; His purpose is comprehensive mercy; His wisdom, knowledge and judgments are deeper than man can fathom, because they underlie the very origin, process and end of all creation.