After his return from Rome, Luther received at the University of Wittenberg the degree of doctor of divinity. Now he was at liberty to devote himself, as never before, to the Scriptures that he loved. He had taken a solemn vow to study carefully and to preach with fidelity the Word of God, not the sayings and doctrines of the popes, all the days of his life. He was no longer the mere monk or professor, but the authorized herald of the Bible. He had been called as a shepherd to feed the flock of God, that were hungering and thirsting for the truth. He firmly declared that Christians should receive no other doctrines than those which rest on the authority of the Sacred Scriptures. These words struck at the very foundation of papal supremacy. They contained the vital principle of the Reformation. (SR 342.1) MC VC

Luther now entered boldly upon his work as a champion of the truth. His voice was heard from the pulpit in earnest, solemn warning. He set before the people the offensive character of sin, and taught them that it is impossible for man, by his own works, to lessen its guilt or evade its punishment. Nothing but repentance toward God and faith in Christ can save the sinner. The grace of Christ cannot be purchased; it is a free gift. He counseled the people not to buy indulgences, but to look in faith to a crucified Redeemer. He related his own painful experience in vainly seeking by humiliation and penance to secure salvation, and assured his hearers that it was by looking away from himself and believing in Christ that he found peace and joy. (SR 342.2) MC VC