With the members of this circle of young Humanists, Luther was on terms of personal friendship. Crotus was able to remind him in after life how, in close intimacy, they had studied the fine arts together at the university. But there is no mention of him in the numerous letters and poems left to posterity by the aspiring Humanists at Erfurt. He had made himself, Crotus adds, a name among his companions as the 'learned philosopher' and the 'musician,' but he never belonged to the 'poets,' which was the favourite title of the young Humanists. Many, including even Melancthon, have lamented that he was not more deeply imbued with the spirit of those 'noble arts and letters,' which educate the mind, and would have tended to soften his rugged nature and manner. But they would have been of little value to him for the quick decision and energy required for the war he had afterwards to wage. Those intellectual treasures and enjoyments kept aloof not only from such contests, but also from sharp and searching investigations of the highest questions of religion and morality, and from the inward struggle, so often painful, which they bring. As regards the merits of Humanism, which Luther again, as a Reformer, eagerly acknowledged, we must not forget how selfishly it withdrew itself from contact and communion with German popular life, nor how it helped to create an exclusive aristocracy of intellect, and allowed the noblest talents to become as clumsy in their own natural mother-tongue, as they were clever in the handling of foreign, acquired forms of art. Luther, in not yielding further to those influences, remained a German. Philosophy, then, engrossed him, and allowed him but little time for other things. And in studying this, he sought to grapple with the highest problems of the human understanding. These problems occupied also the labours of the later Scholastics, however faulty were the forms in which they clothed their ideas. At the same time, these very forms attracted him, from the scope they gave to the exercise of his natural acuteness and understanding. Disputation was his great delight; and argumentative contests were then in fashion at the universities. But in after years, as soon as the contents of the Bible were opened to his inner understanding, and he recognised in its pages the object of real theological knowledge, he regretted the time and labour which he had wasted on those studies, and even spoke of them with disgust. Crotus has already told us of the sociable life that Luther led with his friends. The love for music, which he had shown in school-days, he continued to keep up, and indulged in it merrily with his fellow-students. He had a high-pitched voice, not strong, but audible at a distance. Besides singing, he learned also to play the lute, and this without a master, and he employed his time in this way when laid up once by an accident to his leg.