Why is being born again essential for salvation according to the Bible?

John 3:3 records Jesus' teaching that 'Except a man be born again, he cannot see the kingdom of God.' This new birth, or regeneration, is fundamental to the Christian faith as it denotes a spiritual awakening whereby individuals are made alive to God and His truth. The necessity for being born again highlights that, according to Ephesians 2:1, we are dead in our sins and need divine intervention for spiritual life. This transformative work of the Holy Spirit is critical because it reorients our desires, motivations, and ultimately our eternal destiny, allowing us to live in accordance with God's will.