Martin Luther, Smalcald Articles, The Book of Concord, Part III, Article IV. Of the Gospel.
We will now return to the Gospel, which not merely in one way gives us counsel and aid against sin; for God is superabundantly rich [and liberal] in His grace [and goodness]. First, through the spoken Word by which the forgiveness of sins is preached [He commands to be preached] in the whole world; which is the peculiar office of the Gospel. Secondly, through Baptism. Thirdly, through the holy Sacrament of the Altar. Fourthly, through the power of the keys, and also through the mutual conversation and consolation of brethren, Matt. 18:20: Where two or three are gathered together, etc.
