Jamieson, Fausset and Brown on Romans 11:24

24. For if thou wert cut--"wert cut off"

from the olive tree, which is wild by nature, and wast grafted contrary to nature into a good olive tree; how much more shall these, &c.--This is just the converse of Ro 11:21: "As the excision of the merely engrafted Gentiles through unbelief is a thing much more to be expected than was the excision of the natural Israel, before it happened; so the restoration of Israel, when they shall be brought to believe in Jesus, is a thing far more in the line of what we should expect, than the admission of the Gentiles to a standing which they never before enjoyed."