… the original desire for justification does not include a social component. In Christianity, the idea of mercy through good deeds entered history only during the time of Martin Luther.
But Luther believed in justification by faith alone. It is one of the key points of disagreement between Protestants and Catholics. Catholics adhere to what St. James says in his Epistle: "What shall it profit, my brethren, if a man say he hath faith, but hath not works? Shall faith be able to save him?"