In 1978, he became a lecturer at the Protestant Preachers' Seminary in Wittenberg and also a preacher at All Saints' Church (Schlosskirche, "Castle Church") there, which is closely associated with Martin Luther and his 95 Theses.
The Latin term Poenitentiam agite is used in the first of the Ninety-Five Theses of Martin Luther, and variously translated into English as "Repent" or "Do Penance".
The Ninety-Five Theses | Siege of Ninety-Six | Nineteen Ninety Five and Nowhere | Manifesto of the Ninety-Three | Ninety-Three | Ninety Six, South Carolina | Ninety-Nines | Ninety-nine Novels | Ninety Mile Beach, New Zealand | A Manual for Writers of Research Papers, Theses, and Dissertations |
He also lectured on the Gospel of Matthew, only to be prohibited on account of his popularity and his novel exegesis, especially as he had already been won over to the side of Luther, not only through his ninety-five theses, but still more by personal acquaintance with him at the disputation at Heidelberg in April, 1518.