The certain mark by which a Christian community can be recognized is the preaching of the gospel in its purity.
Martin LutherIn Romans 7, St. Paul says, "The law is spiritual." What does that mean? If the law were physical, then it could be satisfied by works, but since it is spiritual, no one can satisfy it unless everything he does springs from the depths of the heart. But no one can give such a heart except the Spirit of God, who makes the person be like the law, so that he actually conceives a heartfelt longing for the law and henceforward does everything, not through fear or coercion, but from a free heart.
Martin LutherFarewell unhappy, hopeless, blasphemous Rome! The Wrath of God has come upon you, as you deserve. We cared for Babylon, and she is not healed; let us then leave her, that she may become the habitation of dragons, spectres, and witches.
Martin Luther