What does the Bible say about differences between believers and unbelievers?

In 1 Corinthians 4:7, Paul poses the question, 'For who maketh thee to differ from another?' This scripture highlights that the difference between believers and unbelievers is not of their own doing but is solely due to God's sovereign grace. Believers are born again and regenerated by the Holy Spirit, which transforms their hearts and gives them a new desire for Christ and His glory. This transformation is a work of God alone, emphasizing that it is God's grace that makes them new creations in Christ.