The Heidelberg Disputation was held at the lecture hall of the Augustianian order on April 25, 1518. It was here that Martin Luther, as a delegate for his order, began to have occasion to articulate his views. In the defense of his theses, which culminated in a contrast between divine love and human love, Luther defended the doctrine of human depravity and the bondage of the will. Martin Bucer, the reformer of Strasbourg, heard Luther here and became an avid follower. This disputation also led to Johann Eck challenging Luther to the Leipzig Debate.
^Kittelson 1986, p. 112: "Marting Bucer, who later took up what he understood to be Luther's cause, observed in a letter to his friends, 'Luther responds with magnificent grace and listens with insurmountable patience. He presents an argument with the insight of the apostle Paul.'"