The word regeneration describes how someone becomes a child of God. Regeneration is a word that simply means born again. We are born of God as His children (John 1:13). New birth means God becomes our Father and we enter the family of God.
New birth is the work of the Holy Spirit whereby we become a new creation through our Lord Jesus Christ (Ephesians 2:10; 2 Corinthians 5:17). We are born into a new family with a new Father. It is a change of heart through the work of the Holy Spirit. Regeneration is something that the Spirit of God does in us that we could never do for ourselves.
The evidence of new birth is repentance toward God and faith in our Lord Jesus Christ (Acts 20:21). Repentance and faith are often described as conversion. The Holy Spirit enables us to repent and believe on Jesus Christ as Lord (1 Corinthians 12:3). Regeneration and conversion occur simultaneously (John 1:12-13).
In new birth, God takes away our heart of stone, insensitive to things of the Spirit, and gives us a new heart (Ezekiel 36:25-27). The word heart describes the mind, will, and emotions. God changes man from within through new birth.
Through new birth, the mind of man is transformed to understand the things of God (Romans 12:2). The natural man has not experienced new birth. Only after his regeneration can he grow in the grace and knowledge of our Lord Jesus Christ (2 Peter 3:18). Before his new birth, the truth of God as found in Scripture was foolishness to him. Now, his eyes of understanding are opened to spiritual truth in Christ (1 Cor. 1:18-24).
The will of man is changed through new birth. After man's new birth, he has new desires (Philippians 2:13). He wants to do God's will and serve the Lord. He has a desire to live a new and different lifestyle.
New birth changes man's emotions. He is filled with a godly sorrow for his sins of the past, which leads him to repent. Then, he has a new found joy through his faith in Christ (2 Corinthians 7:10; 1 Peter 1:8).