Romans 11:25
25For I don’t desire you to be ignorant, brothers, of this mystery, so that you won’t be wise in your own conceits, that a partial hardening has happened to Israel, until the fullness of the Gentiles has come in,
Wesley: Hardness in part is happened to Israel, till—Israel therefore is neither totally nor finally rejected. The mystery is this divine conduct: part of Israel is hardened for a time, not the whole people forever. “Until” names an end; “partial” names a limit. Do not be wise in your own sight—Gentile pride that writes Israel off.
Arminian interpreters hear both Gentile inclusion and Israel’s future. The fullness of the Gentiles is the appointed “until,” the coming-in that will convince Israel (Wesley on v. 26). Hardening is true and judicial, as in 11:7–10; it is not total reprobation of Jacob’s line. The people remain; the door remains; the mystery is mercy’s timetable, not a closed book.
A partial hardening has happened to Israel, until the fullness of the Gentiles has come in. Partial: not every Israelite is hardened (the remnant of 11:5). Until: the hardening is bounded by Gentile fullness, after which, Calvin will say, the Jews return from their defection.
Lest you to be ignorant, brothers, of this mystery, so that you won’t be wise in your own sight kills the Gentile boast of vv. 18–20. The mystery is God’s one plan: Gentiles come in, and Israel is not discarded. Fullness of the Gentiles is inclusion in the olive tree. Hardening of the rest (v. 7) stands; so does the remnant; so does the future return. Do not read “partial” as if no one is truly hardened, and do not read “until” as if God has no purpose for the Jews.
Key contrast Wesley takes the partial hardening as hardness in part until—neither total nor final rejection of Israel—so the people may yet believe, convinced by Gentile fullness. Reformed readings, with Calvin, take the same partial hardening as the present defection of many Jews (not the remnant) until the Gentiles come in, after which the Jews return and the Israel of God gathered from both is complete.