How do we know regeneration is necessary?

According to Ephesians 2:1, we were made alive in Christ, indicating that without regeneration, we are spiritually dead. The heart that speaks to us by nature leads us into error, claiming we can please God through our works (Job 15:14-16). However, this is a deception; as Romans 3:23 indicates, all have sinned. When the Spirit of God intervenes and performs a work of regeneration, He grants a new heart that is sensitive to God’s Word and will, ultimately revealing our need for His grace and mercy.