The following November he qualified for a Privatdozent in the University of Munich by his thesis "De significationibus in Veteri Testamento præter literam valentibus" (Munich, 1839), and began in December his career of thirty-three years as a lecturer of the Old Testament. In 1841, he became extraordinary professor of Hebrew and of Holy Scripture in the same university, and in 1844 ordinary professor. His lectures, wherein he displayed a solid learning, a constant discretion, and a deep piety, were attended with great profit and delight by an increasing number of students not only from Bavaria, but also from the other German States, and soon caused him to be regarded as one of the most prominent Catholic professors of his day.