How do we know that faith is sufficient for salvation?

The Bible clearly establishes that salvation comes through faith, not works. In Romans 4, Paul argues that Abraham was counted as righteous due to his faith before he performed any works, specifically mentioning the act of circumcision (Romans 4:3). This principle is reiterated in Galatians 3, where Paul emphasizes that all who are of faith are called children of Abraham (Galatians 3:7). The law serves merely as a guardian until Christ came, and now, through faith in Him, believers are justified (Galatians 3:24). Thus, faith is both the means and the assurance of one's salvation in Christ, reaffirming that it is not through personal merit but through trust in God's promise.