"Except for his nepotism, Calixtus III deserves high praise, more especially for the energy, constancy and purpose which he displayed in dealing with the burning question of the day—the protection of Western civilization from the Turkish power. In this matter he gave a grand example to Christendom, and it is to be observed that in the midst of the military and political interest which claimed so large a share of his time and attention, he did not neglect the internal affairs of the Church, and vigorously opposed heresies."