How do we know that regeneration is necessary for salvation?

The necessity of regeneration is rooted in Jesus' teachings, specifically in John 3:5-6, where He emphasizes that being born of water and the Spirit is essential for entering the kingdom of God. Regeneration signifies spiritual rebirth, indicating that our natural state is one of death due to sin. The Bible consistently presents humanity as unable to choose righteousness or come to God on their own. Without this divine act of regeneration, individuals remain in spiritual blindness and cannot trust in Christ as their Savior. Therefore, regeneration is not only a factor of the salvation process but is foundational for any genuine faith and repentance.