We know we are justified by faith because it is declared in Scripture that those who believe in Christ are justified and receive reconciliation with God (Romans 5:1).
Justification by faith is a central tenet of Reformed theology, affirmed in Romans 5:1, which states that since we have been justified by faith, we have peace with God through our Lord Jesus Christ. This means that through faith in Christ's atoning sacrifice, we receive not only forgiveness of sins but also the righteousness required for a relationship with God. Additionally, the assurance of our justification is evidenced by the transformation of our lives and the manifestation of spiritual fruit, demonstrating that we are indeed the children of God.
Scripture References:
Romans 5:1, Ephesians 2:8-9, James 2:26, 1 John 1:9, Galatians 5:4, Hebrews 10:14
Commentary