How do we know regeneration is necessary?

Jesus made it clear that regeneration, or being born again, is essential to see the kingdom of God. In John 3:3, He states, 'Except a man be born again, he cannot see the kingdom of God.' This necessity arises from the biblical truth that our first birth is of the flesh, which cannot inherit the kingdom. The new birth, therefore, is a spiritual act of God, resulting in new life, enabling one to believe and embrace Christ as Savior. Without this divine intervention, individuals remain spiritually dead.