Regeneration is the inward working of the Spirit which induces the sinner to respond to the effectual call. Regeneration should be distinguished from other terms such as justification, adoption, sanctification and salvation. Justification is the act of God whereby the sinner is declared righteous through Christ's perfect righteousness being credited to his account. Adoption is the act of God whereby a person becomes a child of the heavenly Father. Sanctification is the work of God whereby the sinner is renewed after the image of God and enabled more and more to die unto sin and live unto righteousness.
Salvation is a broad term referring to the whole application of redemption to the sinner.
Regeneration is often misused as a synonym for salvation, but the Bible never confuses these terms. Here the apostle distinguishes between the one true and several false views of regeneration. Three popular but false views of regeneration are comprehended in these phrases. Let us consider these. Not of blood.