Abraham's Seed, Heirs of Promise, in Christ

"And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise." (Galatians 3: 29)

We are Christ's, because we have been redeemed, bought back, from the curse of the law:

"Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:" (Galatians 3: 13)

We are Christ's, because He became sin, and we then received His perfect standing of righteousness instead:

"For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him." (2 Corinthians 5: 21)

We have also received the Spirit of Adoption, which has made us all children of God through Christ:

"For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father." (Romans 8: 15)

and

"And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence." (Colossians 1: 18)

If Jesus is the firstborn, then there must be second-born, third-born, etc:

"For it became him, for whom are all things, and by whom are all things, in bringing many sons unto glory, to make the captain of their salvation perfect through sufferings." (Hebrews 2: 10)

So now we can rejoice in the following:

"And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together." (Romans 8: 17)

Everything that belongs to the Son, now belongs to you and me, too, because we are all in the Seed of Abraham, Jesus!

"Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world." (1 John 4: 17)