3.8 See, how rich therefore is a Christian, the one who is baptised! Even if he wants to, he cannot lose his salvation, however much he sin, unless he will not believe. For no sin can condemn him save unbelief alone. All other sins – so long as the faith in God's promise made in baptism returns or remains –all other sins, I say, are immediately blotted out through that same faith, or rather through the truth of God, because He cannot deny Himself. If only you confess Him and cling believing to Him that promises. But as for contrition, confession of sins, and satisfaction – along with all those carefully thought out exercises of men – if you turn your attention to them and neglect this truth of God, they will suddenly fail you and leave you more wretched than before. For whatever is done without faith in the truth of God, is vanity of vanities and vexation of spirit.
Martin Luther, Babylonian Captivity of the Church