Revelation 21:7

He who overcomes shall inherit all things
He who overcomes is ὁ νικῶν [ho nikōn] , by now familiar: the overcomer. The promises to the Seven Churches of Asia were given to “him who overcomes” (Rev. Rev. 2:7+, Rev. 2:11+, Rev. 2:17+, Rev. 2:26+; Rev. 3:5+, Rev. 3:12+, Rev. 3:21+). Through their identification with Jesus, the True Overcomer (John John 16:33; 1Jn. 1Jn. 4:4), they inherit all the promises given to the overcomer and everything which Jesus is given. See Who is the Overcomer? They inherit the kingdom of God prepared for them from the foundation of the world (Mtt. Mat. 25:34). As children of God, believers are “heirs of God and joint heirs with Christ” (Rom. Rom. 8:15). What an incredible promise! Anything and everything which the Father has given to the Son is also the possession of the saints! It is demeaning of the saints, given their eternal position, to compete and strive over earthly morsels when all the while they have bank accounts swelling with eternal value. Paul recognizes this and admonishes the Corinthians not to boast or become partisan in their thinking because “all things are yours: whether Paul or Apollos or Cephas, or the world or life or death, or things present or things to come—all are yours” (1Cor. 1Cor. 3:21). In the same way as an earthly inheritance, the things which pass to the saints do so without reference of their merit or effort. They are attained solely because they stand as brothers of Christ. It is the value accumulated at the Father’s hand which passes to the sons in their inheritance:

In Him also we have obtained an inheritance, being predestined according to the purpose of Him who works all things according to the counsel of His will, that we who first trusted in Christ should be to the praise of His glory. (Eph. Eph. 1:11-12)

Not only is the inheritance bountiful beyond measure, it is also incorruptible. In this world we may lose our job, our savings, our home, our health, and our loved ones, but our inheritance in God is beyond the reach of disaster and loss:

Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead, to an inheritance incorruptible and undefiled and that does not fade away, reserved in heaven for you. (1Pe. 1Pe. 1:3-4)

The MT and NU texts have “these [things]” instead of “all things”.

I will be his God and he shall be My son
He shall be is αὐτὸς ἔσται [autos estai] : He, he shall be. The position of the overcomer as a son of God is emphasized. This phrase emphasizes the reason for the overcomer’s inheritance: his position as a son of God. The phrase son of God describes those who are of direct descent from God. The angels were created directly by God and are the sons of God (Gen. Gen. 6:2, Gen. 6:4; Job Job 1:6; Job 2:1; Job 38:7). Adam was created directly by God and is called the “son of God” (Luke Luke 3:38). In His humanity, being born of the Holy Spirit, Jesus is the Son of God (Luke Luke 1:35).1 And the redeemed, born of God’s Spirit, are the sons of God:

But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. (John. John 1:12-13)

Being born of the Spirit, the overcomer has the Spirit of adoption Who identifies him as a son and therefore an heir:

For as many as are led by the Spirit of God, these are sons of God. For you did not receive the spirit of bondage again to fear, but you received the Spirit of adoption by whom we cry out, “Abba, Father.” The Spirit Himself bears witness with our spirit that we are children of God, and if children, then heirs—heirs of God and joint heirs with Christ, if indeed we suffer with Him, that we may also be glorified together. (Rom. Rom. 8:14-17)

And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, “Abba, Father!” Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ. (Gal. Gal. 4:6-7)

Behold what manner of love the Father has bestowed on us, that we should be called children of God! Therefore the world does not know us, because it did not know Him. Beloved, now we are children of God; and it has not yet been revealed what we shall be, but we know that when He is revealed, we shall be like Him, for we shall see Him as He is. (1Jn. 1Jn. 3:1-2)

Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will. (Eph. Eph. 1:3-5)

The relationship between the overcomer and God is to be one of intimacy, modeled after that of the Son and the Father (John John 1:1; John 17:5). See commentary on Revelation 20:3.

Notes

1 He is the eternal Son of God—even before the incarnation.

Read Revelation 21:7