Sola fide (by faith alone), also historically known as the justification by faith, is a doctrine that distinguishes Protestant denominations from Catholicism, Eastern Christianity, Restorationism in Christianity. The doctrine of Sola Fide or Faith Alone asserts that it is on the basis of God's grace through the believer's faith alone that believers are forgiven their transgressions of the Law of God, rather than on the basis of any good works.