Luther began with lectures upon the Psalms. It is his first work on theology which has remained to posterity. We still possess a Latin text of the Psalter furnished with running notes for his lectures (a copy of it is given in these pages), and also his own manuscript of those lectures themselves. In these also he states that his task was imposed upon him by a distinct command: he frankly confessed that as yet he was insufficiently acquainted with the Psalms; a comparison of his notes and lectures shows further, how continually he was engaged in prosecuting these studies. His explanations indeed fall short of what is required at present, and even of what he himself required later on. He still follows wholly the mediaeval practice of thinking it necessary to find, throughout the words of the Psalmist, pictorial allegories relating to Christ, His work of salvation, and His people. But he was thus enabled to propound, while explaining the Psalms, the fundamental principles of that doctrine of salvation which for some years past had taken such hold on his inmost thoughts and so engrossed his theological studies. And in addition to the fruits of his researches in Scripture, especially in the writings of St. Paul, we observe the use he made of the works of St. Augustine. His acquaintance with the latter did not commence until years after he had joined the Order, and had acquired independently an intimate knowledge of the Bible. It was mainly through them that he was enabled to comprehend the teaching of St. Paul, and to find how the doctrine of Divine grace, which we have already alluded to, was based on Pauline authority. Thus the founder of the Order became, as it were, his first teacher among human theologians. From his lectures on the Psalms Luther proceeded a few years later to an exposition of those Epistles which were to him the main source of his new belief in God's mercy and justice, namely, the Epistles to the Romans and the Galatians. In the convent also at Wittenberg, the direction of the theological studies of the brethren was entrusted to Luther. His fellow-labourer in this field was his friend John Lange, who had been with him also in the convent at Erfurt. He was distinguished for a rare knowledge of Greek, and was therefore a valuable help even to Luther, to whom he was indebted in turn for a prolific advance in learning of another kind. Closely allied with Luther also was Wenzeslaus Link, the prior of the convent, who obtained his degree as doctor of the theological faculty a year before him. These men were drawn together by similarity of ideas, and by a strong and enduring personal friendship; they had possibly been acquainted at the school at Magdeburg. The new life and activity awakened at Wittenberg attracted clever young monks more and more from a distance. The convent, not yet quite finished, had scarcely room enough for them, or means for their maintenance.