What does Romans 11:24 mean?
In the previous verse, Paul wrote that the branches pruned from God's metaphorical olive tree can be grafted back into it. In other words, God has rejected Israel only for now. His temporary rejection is due to her refusal to believe in Christ as the way to be righteous before God. However, He will receive her back when and if the people stop refusing to have faith in Christ.Paul seems to be eager for Gentile Christians to reach two goals. First, to understand that this re-grafting is possible. Second, to look forward to it themselves. After all, God could cut them from the wild olive tree—the unspiritual religions of the world—and graft them into His own cultivated tree through faith in Christ. Therefore, God can graft back into His tree the branches that grew there in the first place.
Grafting wild olive tree branches into cultivated trees is not the natural way to raise olive trees. Symbolically speaking, it was not "natural" for God to do this in order to offer salvation to the Gentiles, though it is exactly what He has done. Paul's point is to highlight the way a Gentile Christian ought to look at the potential salvation of the Jewish people. What could be more natural than for God to welcome the Jewish people back into His family, as they begin to trust in Christ for their salvation?