Being born again is just that, it’s a new birth, a rebirth of the spirit of a man.
John 1:12 Yet to all who received him, to those who believed in his name, he gave the right to become children of God— 13 children born not of natural descent, nor of human decision or a husband’s will, but born of God.
Jesus said this to Nicodemus, John 3:3 “I tell you the truth, no one can see the kingdom of God unless he is born again.” Necodemus looked at that statement with a natural mind, He said, John 3:4 “How can a man be born when he is old?” Nicodemus asked. “Surely he cannot enter a second time into his mother’s womb to be born!” But Jesus was not talking about the body, He was talking about the spirit of a man. John 3:5-7 "I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit. 6 Flesh gives birth to flesh, but the Spirit gives birth to spirit.” It is the spirit of a man that is born again. A literal rebirth, an event that the Father wills and produces.
In 1John being born of God is spoken of multiple times. It is made clear here it is an actual event, not just a term for a different way of thinking. 1 John 5:1 Everyone who believes that Jesus is the Christ is born of God,
Another term used for this event is, New Creation. 2 Cor 5:17 Therefore, if anyone is in Christ, he is a new creation; the old has gone, the new has come! Gal 6:15 Neither circumcision nor uncircumcision means anything; what counts is a new creation.” Being a new creation is just that. The spirit of man has been born of God and becomes a new creation, he is no longer what he was. If the word circumcision can be used to sum up the Law into one word, Paul is saying, that neither obedience to the Law or not obey means anything, what truly counts is being a new creation, born again. For it is the new birth, being “in Christ” that frees our spirit from the Law of Sin and Death, Rom 8:1 Therefore, there is now no condemnation for those who are in Christ Jesus, 2 because through Christ Jesus the law of the Spirit of life set me free from the law of sin and death.
Above in 2 Cor 5:17 the phrase “in Christ” in mentioned. Do a study on this phrase and you will see that it is what a person is once they have true faith in Jesus. We no longer are what we were but we are literally “in Christ” now. United, bonded, one with Him, His very Spirit lives in us, we become a part of His body. The whole truth of being, “in Christ”, is what Jesus Himself revealed to Paul. As you read the NT, look for the phrase, “in Christ” and you will it pops up often.
Being “in Christ” is the Gospel. What the commandments of the Law couldn’t do was change the nature of a man, so God sent His son as a man to become sin, a curse, to die our death, to be judged and to be raised up from death. Death not just being the death of the body, but death, our spirits were dead, they did not have eternal life (not length of life but the nature of God’s life) in them.
In Christ, we are born again by the Spirit, we become New Creations, we are In Christ, united with Him in His death and resurrection. We have been united with Jesus in His crucifixion, Rom 6:6 “For we know that our old self was crucified with him so that the body of sin might be done away with, that we should no longer be slaves to sin,” and by our union with Him in His crucifixion,” our old self was crucified with him” so therefore, “we should no longer be slaves to sin”.
In the New Birth, our spirits are recreated in the righteousness of God, 2 Cor 5:20 God made him who had no sin to be sin for us, so that in him we might become the righteousness of God.” So, since in Christ our old self was crucified and we were birthed by the Spirit of God, by God’s will, with His righteousness in our new spirits, those who have true faith are true sons and daughters of God, by nature. Children of God, not just a neat term for those who think differently now and try to do good and obey God. But an actual rebirth, a new creation, reborn by the very Spirit of God, we are, “In Christ”.
It is this New Birth, being In Christ, in actual union with Him that delivers us from the Law of Sin and death (Romans 7: 23, 35 and 8:2) that our old spirits were slaves to. In Romans 7, Paul is speaking about when he was under the Law of God. Even though the Law showed him what was right, he did wrong because he was a slave to the Law of Sin, the Law of God could not set Him free. Chapter 8 declares the freedom that comes by being “In Christ”. A person who is, in Christ, has died to the Law of Sin and has been reborn by the Spirit and will of the Father. The Law of God could not do this, but God did this In Christ for us. That is grace, unmerited favor. No amount of trying hard to do right could ever change your nature, but the Father did by placing those who turn to Jesus, In Christ. So when Jesus raised up from death, so did they who believe. The same Spirit that raised Jesus from death now dwells in those who believe, and it is this that gives us power and authority over sin and the devil.
Our union with Jesus the Christ, to be in Christ, is our only hope. Col 1:25 I have become its servant by the commission God gave me to present to you the word of God in its fullness— 26 the mystery that has been kept hidden for ages and generations, but is now disclosed to the saints. 27 To them God has chosen to make known among the Gentiles the glorious riches of this mystery, which is Christ in you, the hope of glory.
The cross of Christ is the work of the Father to bring us salvation from our enemy, sin. It is in the cross and all that it entails, His becoming sin, a curse, His death, the Father crushing Him (Isa 53:10) judgment and resurrection. That is why Paul makes this declaration, Gal 6:14 May I never boast except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world.” Through the cross of Christ, I have died to the ways of this world. Jesus has set my spirit free from it’s slavery to sin and the devil. For freedom sake, Christ set us free.
The Cross of Christ and all it includes, is the debt that was paid for our salvation, for our New Birth, to make us New Creations In Christ.
If a person only thinks being Born Again is just a phrase for a change of mind, and for trying to follow the teachings of Jesus, they do not understand what the Father actually did In Christ.
Study the scriptures with these thoughts in your mind. This is not some secret you have to twist your head and look a certain way to see it, it is everywhere. It is the Gospel.