How do we know salvation is by grace and not works?

In Galatians 3, Paul argues against the notion that salvation could be earned through works of the law. He stresses the futility of trying to achieve righteousness through human effort, demonstrating that such attempts lead only to curse, as stated in Galatians 3:10, ‘Cursed is everyone who does not continue to do everything written in the Book of the Law.’ In contrast, salvation through grace affirms that it is God who initiates faith in the believer, as seen in Ephesians 2:8-9, where it is made clear that it is by grace we have been saved, through faith, and not from ourselves; it is the gift of God. This gift ensures that no one can boast of their own deeds, solidifying the truth that grace alone saves.