This brings us to the end of the fundamental part of the treatise. It was not Luther's intention, however, to speak only on the essence of good works and their fundamental relation to faith; he would show, too, how the "best work," faith, must prove itself in every way a living faith, according to the other commandments. Luther does not proceed to this part, however, until in the fundamental part he has said with emphasis, that the believer, the spiritual man, needs no such instruction (I. Timothy 1:9), but that he of his own accord and at all times does good works "as his faith, his confidence, teaches him." Only "because we do not all have such faith, or are unmindful of it," does such instruction become necessary. Nor does he proceed until he has applied his oft repeated words concerning the relation of faith to good works to the relation of the First to the other Commandments. From the fact, that according to the First Commandment, we acquire a pure heart and confidence toward God, he derives the good work of the Second Commandment, namely, "to praise God, to acknowledge His grace, to render all honor to Him alone." From the same source he derives the good work of the Third Commandment, namely, "to observe divine services with prayer and the hearing of preaching, to incline the imagination of our hearts toward God's benefits, and, to that end, to mortify and overcome the flesh." From the same source he derives the works of the Second Table. The argument on the Third and Fourth Commandments claims nearly one-half of the entire treatise. Among the good works which, according to the Third Commandment, should be an exercise and proof of faith, Luther especially mentions the proper hearing of mass and of preaching, common prayer, bodily discipline and the mortification of the flesh, and he joins the former and the latter by an important fundamental discussion of the New Testament conception of Sabbath rest. Luther discusses the Fourth Commandment as fully as the Third. The exercise of faith, according to this Commandment, consists in the faithful performance of the duties of children toward their parents, of parents toward their children, and of subordinates toward their superiors in the ecclesiastical as well as in the common civil sphere. The various duties issue from the various callings, for faithful performance of the duties of one's calling, with the help of God and for God's sake, is the true "good work."