What does living by the faith of the Son of God mean?

To live by the faith of the Son of God, as mentioned in Galatians 2:20, means that believers rely on Christ's faithfulness, not their own, for every aspect of spiritual life. Paul emphasizes that this life is characterized by dependence on Christ, who leads, sustains, and empowers His people. This doctrine highlights the difference between living under the law and living in the grace provided through faith in Christ. It assures believers that they are supported by a loving Savior who continually guides and keeps them, resulting in a life of service and obedience fueled by gratitude for His redeeming work.