“Jesus answered, Verily, verily, I say unto thee, except a man be born of water and of the Spirit, HE CANNOT ENTER INTO THE KINGDOM OF GOD. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.” John 3:5-6
Let me start with Verses sixth, born of the flesh means born by father and mother and born of the spirit means born of God. In verses fifth, according to Jesus, a man has to be born again by Spirit. I will talk later about the role of water in New Birth.
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.” NIV
To be born again is to believe in the name of the Son of God; that He is truly the Son of God and receives Him into your heart by calling Him with sincere heart, then follows Him all the days of your life.
“That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.” Romans 10:9
Read this in The Living Bible “For if you tell others with your own mouth that Jesus Christ is your Lord and Believe in your own heart that God raise him from the dead, you will be saved.” Faith is proved by confession and action. If you can’t act according to your confession, then it is not a true faith. Even Satan believes but he can’t act his faith because he is a rebel.
James tells us; “You believe that there is one God. You do well. Even the demons believe-and tremble!” But do you want to know, O foolish man, that faith without works is dead?” James 2:19-20 NKJV. You’re to proof your faith or confession by acting accordingly.
THROUGH HEARING OF THE WORD
“Of his own will begat he us with the word of truth, that we should be a kind of first fruits of his creatures.” James 1:18
The word “beget” means give birth to. How? By the word of truth which is God’s word.
1Peter 1:23 “Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth forever.” Corruptible seed means human sperm; when you’re born by human you’re just a sinner like them. Incorruptible seed means the word of God which is the sperm of God.
Here again we see the word. John 1:1-3 tells you all things were made by the Word, who is Jesus in the flesh, so when you hear the gospel of Jesus Christ and received it into you, at that moment your spirit man will be recreated.
Just as all things were made by the Word the same Word still recreate when preached and received by faith. Apostle Paul described in brief in his epistle to Ephesus. “And because of what Christ did, all you others too, who heard the Good News about how to be saved, and trusted Christ, were marked as belonging to Christ by the Holy Spirit, who long ago had been promised to all of us Christians.” Ephesians 1:13 TLB
See it in KJV translation; “In whom you trusted, after that you heard the word of truth, the gospel of your salvation: in whom after you believed, you were sealed with that Holy Spirit of promise,” Ephesians 1:13
What does it tell you? is saying when they heard the word of truth which is the gospel of salvation of Jesus Christ, they believed, after they believed God gave them the Holy Spirit as a mark/confirmation that they belong to Him.
This is the New Birth, when a man believes the Gospel; the Holy Spirit recreated and baptizes him into the Body of Christ. That is why Jesus said that a man must be born again of Spirit.