We have seen how the Church had found persuasion powerless to arrest the spread of heresy. St. Bernard, Foulques de Neuilly, Durán de Huesca, St. Dominic, St. Francis, had successively tried the rarest eloquence to convince, and the example of the sublimest self-abnegation to convert. Only force remained, and it had been pitilessly employed. It had subjected the populations, only to render heresy hidden in place of public; and, in order to reap the fruits of victory, it became apparent that organized, ceaseless persecution continued to perpetuity was the only hope of preserving Catholic unity, and of preventing the garment of the Lord from being permanently rent. To this end the Inquisition was developed into a settled institution manned by the Mendicant Orders, which had been formed to persuade by argument and example, and which now were utilized to suppress by force.

The organization of the Inquisition was simple, yet effective. It did not care to impress the minds of men with magnificence, but rather to paralyze them with terror. To the secular prelacy it left the gorgeous vestments and the imposing splendors of worship, the picturesque processions and the showy retinues of retainers. The inquisitor wore the simple habits of his Order. When he appeared abroad he was at most accompanied by a few armed familiars, partly as a guard, partly to execute his orders.