Such assertions, as a matter of fact, destroy all the claims made by the visible Church to submission to her teaching. Further, they proclaim the principle of the fullest independence of the Christian in matters of faith; nothing but private judgment and personal inspiration can decide. Luther failed to see that, logically, every barrier must give way before this principle of liberty, and that Holy Scripture itself loses its power of resistance, subjectivism first invading its interpretation and then, in the hands of the extremer sort of critics, questioning its value and divine origin. The inner consequences of Luther’s doctrine on freedom and autonomy have been clearly pointed out even by some of the more advanced Protestant theologians. Adolf Harnack, for instance, recently expressed the truth neatly when he said that “Kant and Fichte were both of them hidden behind Luther.”[81] The second work “On the Babylonish Captivity,” with its sceptical tendency, of which, however, Luther was in great part unconscious, also vindicates this opinion. The very arbitrariness with which the author questions facts of faith or usages dating from the earliest ages of the Church, must naturally have awakened in such of his readers as were already predisposed a spirit of criticism which bore a startling resemblance to the spirit of revolt. Here again, in one passage, Luther comes to the question of the right of placing private judgment in matters of religion above all authority. He here teaches that there exists in the assembly of the Faithful, and through the illumination of the Divine Spirit, a certain “interior sense for judging concerning doctrine, a sense, which, though it cannot be demonstrated, is nevertheless absolutely certain.” He describes faith, as it comes into being in every individual Christian soul, “as the result of a certitude directly inspired of God, a certitude of which he himself is conscious.”[82] What this private judgment of each individual would lead to in Holy Scripture, Luther shows by his own example in this very work; he already makes a distinction based on the “interior sense” between the various books of the Bible, i.e. those stamped with the true Apostolic Spirit, and, for instance, the less trustworthy Epistle of St. James, of which the teaching contradicts his own. Köstlin, with a certain amount of reserve, admits: “This he gives us to understand, agreeably with his principles and experience; it is not our affair to prove that it is tenable or to vindicate it.”[83] Luther says at the end of the passage in question: “Of this question more elsewhere.” As a matter of fact, however, he never did treat of it fully and in detail, although it concerned the fundamentals of religion; for this omission he certainly had reasons of his own.