How do we know that regeneration is essential for salvation?

Regeneration, or the new birth, is fundamental to salvation because it indicates a complete transformation of the believer's heart and spirit. According to the Reformed perspective, as articulated in the scriptures, a person must be regenerated by the Holy Spirit to truly know God and enter into a relationship with Him. This process goes beyond mere intellectual agreement or emotional response; it is a divine miracle that enables one to believe genuinely and confess Christ.

The necessity of regeneration is rooted in the understanding that humans, in their natural state, are dead in sin and incapable of coming to Christ without the gracious initiative of God (Ephesians 2:1). John 3:3 underscores the necessity of being born again to see the kingdom of God. Thus, regeneration is indispensable, as it ensures that the believer is not just outwardly conforming to Christian practices but is inwardly changed, marked by faith and spiritual life.