Romans 11:12

Now, if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles, how much more their fullness?

The apostle here again guards against a false conclusion: Surely Israel, the great mass of the Jewish nation, did not stumble for the purpose of falling? Was the fall of the Jews, the result of their taking offense at the Messiah, a purpose and object of God, in the sense that He takes pleasure and satisfaction in their destruction? That is a gross misunderstanding of God's essence and qualities which many people even today read into the arguments of Paul. And therefore he interposes a horrified: By no means! God under no circumstances purposes and plans the destruction of any man; He never takes delight in the wrong-doing and the consequent damnation of sinners. But the design which God took out of the self-imposed misfortune and condemnation of the Jews was another: that through their transgression salvation should come to the Gentiles, and that the Jews should be provoked to zeal, to be stimulated to follow. The unbelief of the Jews, their rejection of the Messiah, has resulted in this, that the Gospel of salvation was brought to the Gentiles, as the Book of Acts shows in many instances. But the fact that the Gentiles now accepted the Word of salvation had the purpose to excite the emulation of the Israelites, to urge them to follow the example of the Gentiles And also to become partakers of the redemption in Christ. In the great mass of the Jews that had not yet accepted Christ there were many that had not yet hardened their heart, but that simply followed their leaders without proper knowledge of the dangerousness of their position. Upon these, the remnant according to the election of grace, the fact that the Gentiles accepted the Gospel and the Messiah was intended to make such an impression that they would thereby be urged also to accept the salvation of Christ.

And a further result of the transgression of Israel is noted: Furthermore, if their trespass is the wealth of the world, and their diminution the wealth of the Gentiles, how much more their fullness! The transgression of the Jews, their denial and rejection of the Messiah, has brought these same riches, salvation in Christ, to the world at large; it was due largely to their defection that the apostles were obliged to turn to the Gentiles. And so the loss of the Jews, what they lost, their damage, their hurt, what they deprived themselves of by their foolishness, was the gain of the world outside of Israel, it brought salvation to the Gentiles. But if this is true, how much more will the fullness of the Jews result in the benefit of the Gentiles! The fullness is that which is filled up, made full, completed, the sum total of those out of the midst of the Jewish people who are under the election of grace, v. 5. The fact that their full number is gradually reached, that the body of believers from their midst is made complete, will result in a further gain for the world. This is treated at length in the next section.