How do we know the Gospel is about grace?

The message of the Gospel is fundamentally about grace, as indicated in Galatians 1:3-4, where Paul mentions, 'Grace be to you and peace from God the Father and from our Lord Jesus Christ, who gave Himself for our sins.' This clearly illustrates that grace is an unearned gift; it’s not based on what we can do but rather on what Christ has done for us. Our standing before God is solely reliant on His grace, emphasizing the notion that our salvation is initiated and sustained by Him alone, not our works or efforts.