Faith alone: Through faith in Jesus Christ, we receive, as our very own, the righteousness and forgiveness Jesus won for all by his holy life and substitutionary death. Those who believe in Jesus have eternal life. Those who do not believe in Jesus reject the forgiveness he won for them on the cross, and they will perish eternally (Mk 16:16). The three principles of Scripture alone, grace alone, and faith alone are at the center of the study of Christian doctrine. Lutheran teachers of Christian doctrine