3. The Importance of the Work.—Inquiring now into the importance of the book, we note that Luther's impression evidently was perfectly correct, when he wrote to Spalatin, long before its completion—as early as March 15.—that he believed it to be better than anything he had heretofore written. His book, indeed, surpasses all his previous German writings in volume, as well as all his Latin and German ones in clearness, richness and the fundamental importance of its content. In comparison with the prevalent urging of self-elected works of monkish holiness, which had arisen from a complete misunderstanding of the so-called evangelical counsels (comp. esp. Matthew 19:16-22) and which were at that time accepted as self-evident and zealously urged by the whole church, Luther's argument must have appeared to all thoughtful and earnest souls as a revelation, when he so clearly amplified the proposition that only those works are to be regarded as good works which God has commanded, and that therefore, not the abandoning of one's earthly calling, but the faithful keeping of the Ten Commandments in the course of one's calling, is the work which God requires of us. Over against the wide-spread opinion, as though the will of God as declared in the Ten Commandments referred only to the outward work always especially mentioned, Luther's argument must have called to mind the explanation of the Law, which the Lord had given in the Sermon on the Mount, when he taught men to recognize only the extreme point and manifestation of a whole trend of thought in the work prohibited by the text, and when he directed Christians not to rest in the keeping of the literal requirement of each Commandment, but from this point of vantage to inquire into the whole depth and breadth of God's will—positively and negatively—and to do His will in its full extent as the heart has perceived it. Though this thought may have been occasionally expressed in the expositions of the Ten Commandments which appeared at the dawn of the Reformation, still it had never before been so clearly recognized as the only correct principle, much less had it been so energetically carried out from beginning to end, as is done in this treatise. Over against the deep-rooted view that the works of love must bestow upon faith its form, its content and its worth before God, it must have appeared as the dawn of a new era (Galatians 3:13-35) when Luther in this treatise declared, and with victorious certainty carried out the thought, that it is true faith which invests the works, even the best and greatest of works, with their content and worth before God.