No branch of history affords such a significant illustration of human craft and human weakness as the story of the ambition, the intrigues, and the vices of the Popes. In its consideration, the fact must never be lost sight of that the Holy Father was, as a necessary consequence of his creed, the earthly embodiment of spiritual perfection,--the vicegerent of Almighty God. Either the admission of a single error of judgment, or a controversy involving the most insignificant tenet sustained by one pope and disputed by his successor, was fatal to the claim of infallibility, which was the foundation of the entire ecclesiastical system. The omniscience conferred by the apostolic succession, which traced its origin to the Saviour Himself, could never be mistaken. The example of the Supreme Pontiff, the relations he sustained to the great officials of his court, his occupations, his diversions, his tastes, his habits, his conversation, were of far greater importance in the eyes of the meanest peasant of some remote kingdom who acknowledged his mission than were the most glorious achievements of any temporal sovereign. The possibilities for the attainment to positions of such authority and influence as were offered by the Roman Catholic hierarchy had been unknown to Paganism. These opportunities enabled men of base origin, but of extraordinary talents, to reach the chair of St. Peter, men whose faults were overlooked or palliated by the indulgent spirit of the age on account of the successful prosecution of their schemes and the veneration which attached to their calling.