Yet the work is one of no little historical as well as antiquarian interest. It has done its part in one of the greatest intellectual and religious conflicts of the world. It is the sword that a giant wielded, and that has done execution on a broad field. In the great armory of the Reformation-writings, scarcely another deserves a more conspicuous place. It presents those views of the relative spheres of Divine and human authority which became prevalent wherever the cause of Reform advanced. It unmasked popular errors, rebuked ecclesiastical corruption, and vindicated most effectively the simple doctrines of faith. Here, moreover, we see Luther clad in the armor with which he boldly challenged the Papacy to a lifelong combat. The man is before us, girded for the battle, and we see the weapons upon which he relies. If one of those cannon balls with which English valor won the battle of Cressy,--the first in which the efficiency of the new invention was tested,--could be picked up there now, and it could be ascertained that it did service in that famous battle, it would be an object of no small interest, at least to the antiquary; but in regard to this treatise of Luther, we know full well that Rome felt its visitation as something more terrible than a bombshell exploding beneath the dome of St. Peter's. Under the authority of Peter himself it demolished the very foundations of the throne upon which his pretended successors were seated, and gave a most effective impulse to the onward movement of reform. Nor is this all. It is still capable of doing effective service. After all the rust and tarnish of three centuries, these words of Luther are remarkably fresh, and seem almost like a living utterance of to-day. Their critical value is not indeed great, although by no means contemptible, for the quick sagacity of the Reformer in detecting the meaning and the force of the Scriptural argument, is evident on every page, and is rarely at fault; but his clear views of the Gospel, his untrammeled freedom of thought, his strong good sense, and his most effective energy of application are everywhere conspicuous. His language is uniformly simple and direct. The exposition contained in this volume was first delivered from the pulpit. According to the title-page, it is Scripture "preached and explained," and in addressing it to the people, Luther did not fail to keep in view the object upon which he set so high an estimate, when he said, "I preach as simply as possible. I want the common people, and children, and servants, to understand me." The care with which he fortifies his positions with Scriptural citations is likewise obvious. He rarely presents views upon any theme from which one who acknowledges the authority of Scripture will feel forced to dissent, unless, with some, the subject of baptism should an exception. In regard to this, he speaks like one who as yet sees "men as trees walking."