What is meant by the term 'new birth' in Christianity?

In Christian theology, particularly within the sovereign grace framework, the new birth signifies a profound change in a person's spiritual state. It represents the act by which God imparts new life to the heart of a sinner, enabling them to respond to the gospel. This concept is biblically rooted in passages like John 3:3, where Jesus tells Nicodemus, 'You must be born again.' The speaker in the sermon conveys that prior to being born again, individuals are in enmity with God, as expressed throughout the teachings of Scripture. This miraculous regeneration is solely God's work, further emphasizing mankind's inability to initiate this transformation on their own, grounding the believer's hope in the grace and mercy of God.