As professor, Melanchthon had at the outset an audience of from five to six hundred, and, later, his hearers numbered as many as 1500. He was perfectly aware that this was due to the renown which the University of Wittenberg had acquired through Luther, and the success of their common enterprise bound him still more closely to the ecclesiastical innovation. To the very end of his life he laboured in the interests of Lutheranism in the lecture-hall, at religious disputations, by his printed works, his memoranda, and his letters, by gaining new friends and by acting as intermediary when dissension threatened.—In his translation of the Bible Luther found a most willing and helpful adviser in this expert linguist. It is worthy of note that he never took the degree of Doctor of Divinity or showed the slightest desire to be made equal to his colleagues in this respect. Unlike the rest of his Wittenberg associates, he had not been an ecclesiastic previous to leaving Catholicism, nor would he ever consent to undertake the task of preacher in the Lutheran Church, or to receive Lutheran Orders, though for some years he, on Sundays, was wont to expound in Latin the Gospels to the students; these homilies resulted in his Postils. When Luther at last, in 1520, persuaded him to marry the daughter of the Burgomaster of Wittenberg, he thereby succeeded in chaining to the scene of his own labours this valuable and industrious little man with all his vast treasures of learning. At the end of the year Melanchthon, under the pseudonym of Didymus Faventinus, composed his first defence of Luther, in which he, the Humanist, entirely vindicated against Aristotle and the Universities his attacks upon the rights of natural reason.[1056]