God had promised Abraham that he would become the father of many nations, yet, he and Sara did not have a child. They were well past child-bearing age when God delivered on His promise to Abraham. Though, from a human standpoint, it was impossible, it was not hard for God to fulfill His promise. After all, when He speaks, the sound of His voice creates whatever He says. He spoke the universe into existence. So, bringing forth a child from an elderly couple would not be difficult for Him. This promise was passed down from generation to generation. Many of them died before the promise was realized, but they died knowing that God is faithful and He would fulfill every promise. They pressed on in obedience to God and arrived at a heavenly country where they will spend an eternity with God because they were faithful.
20 But we are citizens of heaven, where the Lord Jesus Christ lives. And we are eagerly waiting for him to return as our Savior. — Phil. 3:20 NLT
“The Gospel has come to you because it’s on its way to someone else.” -Anonymous
23 Before the coming of this faith, we were held in custody under the law, locked up until the faith that was to come would be revealed. 24 So the law was our guardian until Christ came that we might be justified by faith. 25 Now that this faith has come, we are no longer under a guardian. 26 So in Christ Jesus you are all children of God through faith, 27 for all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus. 29 If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise.—Gal. 3:23-29 (NIV)
Before the resurrection of Jesus Christ, man had lived in sin and bondage ever since Adam committed the original sin. For a few hundred years man lived without a tutor or guardian, the the law was given to teach us until the great mystery of the Good News was revealed. 25 Now to him who is able to establish you in accordance with my gospel, the message I proclaim about Jesus Christ, in keeping with the revelation of the mystery hidden for long ages past, 26 but now revealed and made known through the prophetic writings by the command of the eternal God, so that all the Gentiles might come to the obedience that comes from faith— 27 to the only wise God be glory forever through Jesus Christ! Amen.–Romans 16:25-27 (NIV)
We are all saved by “grace through faith” and we are all one body, the body of Christ and are therefore the seed of Abraham. If we are the seed of Abraham, then we are heirs and members of the “heir force”. And one glorious day, we will all fly home to be with our Lord and Savior for eternity!