Another trait of his character was his love of peace. He had an innate aversion to quarrels and discord; yet, often he was very irritable. His irenical character often led him to adapt himself to the views of others, as may be seen from his correspondence with Erasmus and from his public attitude from the Diet of Augsburg to the Interim. It was said not to be merely a personal desire for peace, but his conservative religious nature that guided him in his acts of conciliation. He never could forget that his father on his death-bed had besought his family "never to leave the church." He stood toward the history of the church in an attitude of piety and reverence that made it much more difficult for him than for Luther to be content with the thought of the impossibility of a reconciliation with the Roman Catholic Church. He laid stress upon the authority of the Fathers, not only of Augustine, but also of the Greek Fathers.