It was such qualities of character, namely amiability, consideration and tactfulness that made R. Isserles both beloved and respected by his colleagues and contemporaries. Not even once do we find him engaged in an overheated controversy which would result in enmity, as did R. Luria. Even when he dissented, it was done with consideration and regard for the feelings of his opponents. Little wonder, therefore, that R. Isserles was highly esteemed by all who came in contact with him.
Rabbi Asher Siev, “The Period, Life and Work of Rabbi Moses Isserles” (PhD. Diss., Yeshiva University, 1943), 30.