Another source of Luther’s power was that he had been led step by step, and that his countrymen could follow him deliberately without being startled by any too sudden changes. He was one of themselves; he took them into his confidence at every stage of his public career; they knew him thoroughly. He had been a monk, and that was natural for a youth of his exemplary piety. He had lived a model monastic life; his companions and his superiors were unwearied in commending him. He had spoken openly what almost all good men had been feeling privately about Indulgences in plain language which all could understand; and he had gradually taught himself and his countrymen, who were following his career breathlessly, that the man who trusted in God did not need to fear the censures of Pope or of the clergy. He emancipated not merely the learned and cultivated classes, but the common people, from the fear of the Church; and this was the one thing needful for a true reformation. So long as the people of Europe believed that the priesthood had some mysterious powers, no matter how vague or indefinite, over the spiritual and eternal welfare of men and women, freedom of conscience and a renovation of the public and private moral life was impossible. The spiritual world will always have its anxieties and terrors for every Christian soul, and the greatest achievement of Luther was that by teaching and, above all, by example, he showed the common man that he was in God’s hands, and not dependent on the blessing or banning of a clerical caste. For Luther’s doctrine of Justification by Faith, as he himself showed in his tract on the _Liberty of a Christian Man_ (1520), was simply that there was nothing in the indefinite claim which the mediæval Church had always made. From the moment the common people, simple men and women, knew and felt this, they were freed from the mysterious dread of Church and priesthood; they could look the clergy fairly in the face, and could care little for their threats. It was because Luther had freed himself from this dread, because the people, who knew him to be a deeply pious man, saw that he was free from it, and therefore that they need be in no concern about it, that he became the great reformer and the popular leader in an age which was compelled to revise its thoughts about spiritual things. Hence it is that we may say without exaggeration that the Reformation was embodied in Martin Luther, that it lived in him as in no one else, and that its inner religious history may be best studied in the record of his spiritual experiences and in the growth of his religious convictions. § 2. Luther’s Youth and Education.