Faith in Christ saves us as it is a gift from God that recognizes Christ as the source of our salvation.
The assurance of salvation by faith in Christ comes from the teachings of scripture, particularly in Ephesians 2:8-9, which states, 'For by grace are ye saved through faith; and that not of yourselves: it is the gift of God.' This emphasizes that faith itself is not a work we perform, but rather a divine gift. When the leper in Luke 17 was told, 'Thy faith hath saved thee' (Luke 17:19), it signifies that saving faith rests on the completed work of Christ, acknowledging Him as the sole Savior who justifies the ungodly. Our faith recognizes and receives the righteousness of Christ rather than relying on our own actions or merits.
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