How wonderful it is that the Word of God is so well tied together. Every part supports every other part. It is possible to “prove” almost any piece of doctrine if we only take isolated bits from here and there. But when we read the Word in its entirety some of the ‘doctrines’ don’t hold together. Others are completely disproven. Take for instance the popular concept that there will still be a “remnant of the Jews” left at the end of time who will be gloriously ushered into the presence of God because of the old promises.
One of the best places to see this is in Romans 11 as Paul again explains the way the Kingdom was opened to the Gentiles. For if the firstfruit be holy, the lump is also holy: and if the root be holy, so are the branches. And if some of the branches be broken off, and thou, being a wild olive tree, wert grafted in among them, and with them partakest of the root and fatness of the olive tree; Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee. 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. Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off. And they also, if they abide not still in unbelief, shall be grafted in: for God is able to graft them in again.
Here we find the explanation of how the Jews were ‘broken off’ because of unbelief. And in those empty spaces we, as believing Gentiles were able to be grafted in. The Jews who did not accept Christ as Messiah/Savior were broken off. They lost their part in the Promise of God and now we become partakers of that promise. (That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel: Ephesians 3: 6)
Now we come to those Jews who will be saved. Paul says that even if they had initially been broken off, if they come to believe in the Christ they can just as easily be grafted back in. It is by this method that Jews will be saved thus fulfilling the promises. blindness in part is happened to Israel, until the fulness of the Gentiles be come in. And so all Israel shall be saved And so all Israel shall be saved:
“In the fullness of time,” those Israelites who come to believe in Christ will be saved, just as the Gentiles were . . . thus establishing the entire Family of God: For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him, Romans 10:12
And what is wonderful is that the same message is repeated in other places in the Word. It all fits together and supports all other parts. It is 'cohesive.'