Romans 11:19-21 — Thou wilt say then, The branches were broken off, that I might be grafted in.
Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
For if God spared not the natural branches, take heed lest He also spare not thee.
Gentiles are strangers (Ephesians 2:5).
branches broken off — the nation of Israel
I might be grafted in — Gentile nations
thou standest by faith — there is no personal merit that earned Gentiles their opportunity — faith excludes boasting (3:27)
fear — Gentiles should fear stumbling as Israel did.
Incalculabe harm has been done by those who have attempted to apply our text primarily to individuals. An individual who is once grafted into Christ by faith can never be broken off from Christ. He is not going to be a mutilated trunk in Heaven forever … When it is seen that Paul is speaking of the Jews' being removed nationally, to be replaced nationally by Gentiles, we are fully prepared for that which will follow in a few verses. — Donald Grey Barnhouse, God's Covenants, page 144.