18 We know that whoever is born of God does not sin; but he who has been born of God keeps himself, and the wicked one does not touch him. 19 We know that we are of God, and the whole world lies under the sway of the wicked one. 20 And we know that the Son of God has come and has given us an understanding, that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life. 21 Little children, keep yourselves from idols. Amen. (1 John 5:18–21, NKJV)
God assures Christians of knowing we have eternal life in the Son of God (1 Jno. 5:11-13). We are confident of this wonderful blessing in Christ because we are born of God through His word (Jno. 1:12-13; 3:3, 5; 1 Pet. 1:23). John tells us some things we know as God’s children, which testify to God’s grace and our faith as His children. 1) We know whoever is born of God does not practice sin, but guards himself against the evil one (5:18). We do not say we “have no sin,” but that we practice righteousness (1 Jno. 1:8; 2:29; 3:6-10). 2) We know we are different from the world (5:19). We do not love the world and its lusts, but God and His will (1 Jno. 2:15-17). 3) We know the Son of God has given us an understanding (5:20). Jesus Christ is the Truth, and His word lights our path (Jno. 14:6; 1 Jno. 1:6-7). We have fellowship with the Father and the Son when we walk in (obey) apostolic truth (1 Jno. 1:2-3; 2:3-6; 3:24). Let us guard ourselves against false gods and their false concepts of salvation by faithfully following Jesus Christ (1 Jno. 5:21).
12 But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: 13 who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. (John 1:12–13, NKJV)
God gives believers the right to become His children – to be saved in the Son (1 John 5:11-12). John explains that birth into the family of God is not due to physical lineage (“not of blood”) or fleshly procreation (“of the will of the flesh”). The apostle Paul said, “nor are they all children because they are the seed of Abraham” (Romans 9:7). One is not born into the family of God by the will of man. Neither human desires and wishes, doctrines, creeds or confessions produce the new birth. Birth into the family of God is of faith, not of flesh. “For you are all sons of God through faith in Christ Jesus. For as many of you as were baptized into Christ have put on Christ” (Galatians 3:26-27). Children of God are born of God and have life in the Son. Children of God walk in the light. Such rich blessings of salvation come “by grace, through faith” to those who put on Christ, which occurs when the believer is baptized into Christ (Galatians 3:27).
11 He came to His own, and His own did not receive Him. 12 But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: 13 who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. (John 1:11–13, NKJV)
Jesus came to the Jewish people, and they rejected Him as the Messiah. But, their refusal to receive Him did not prevent God from declaring Jesus to be Lord and Christ (Psa. 2:1-7; Acts 2:33-37). Now, everyone who receives Him has been given the right to become a child of God. It is precisely those who “believe in His name” that have the right to be born of God to become His child. Some have this verse 12 all wrong. They think it says, “receive + believe = become.” They use this verse to say you should pray for salvation, but nothing is said of prayer here. The verse actually says, “received Him (believed) = right to become” children of God. If you receive Jesus to be the Christ, the Son of God (that is, you believe it), then you have the right to become a child of God. That truth is embedded perfectly into the call of the gospel at the Great Commission: “Go into all the world and preach the gospel to every creature. He who believes and is baptized will be saved; but he who does not believe will be condemned” (Mk. 16:15-16). You have the right to become a child of God when you receive (believe) He is the Christ, the Son of God. But, without faith you cannot be saved (Jno. 8:23-24).