His relations, moreover, at Heidelberg with his fellow-members of the Order, and, above all, with Staupitz, remained unclouded. Staupitz was re-elected here as Vicar of the Order; the office of provincial Vicar passed from Luther to John Lange, of Erfurt, his intimate friend and fellow-thinker. The question about indulgences had not entered at all into the business of the chapter. But at a disputation held in the convent, according to custom, Luther presided, and wrote for it some propositions embodying the fundamental points of his doctrines concerning the sinfulness and powerlessness of man, and righteousness, through God's grace, in Christ, and against the philosophy and theology of Aristotelian Scholasticism. He attracted the keen interest of several young inmates of the convent who afterwards became his coadjutors, such as John Brenz, Erhardt Schnepf, and Martin Butzer. They marvelled at his power of drawing out the meaning from the Scriptures, and of speaking not only with clearness and decision, but also with refinement and grace. Thus his journey served to promote at once his reputation and his influence. On his return to Wittenberg on May 15, after an absence of five weeks, he hastened to complete a detailed explanation in Latin of the contents of his theses, under the title of 'Solutions,' the greatest and most important work that he published at this period of the contest. The most valuable fruit of the controversy so far as regards Luther and his later work, and evidence of which is given in these 'Solutions,' was the advance he had made, and had been compelled to make, in the course of his own self-reasoning and researches. New questions presented themselves: the inward connection of the truth became gradually manifest: new results forced themselves upon him: his anxiety to solve his difficulties still continued. Luther in his theses, when speaking of the call of Jesus to repentance, had never indeed admitted that the sacrament of penance enjoined by the Church, with auricular confession and the penances and satisfactions imposed by the priest, was based on God's command or the authority of the Bible. He now openly acknowledged and declared that these ecclesiastical acts were not enjoined by Christ at all, but solely by the Pope and the Church.