Irishman Frank Duff founded the Legion of Mary, a lay apostolic organization at the service of the Roman Catholic Church, under ecclesiastical guidance. Its twofold purpose is the spiritual development of its members and advancing the reign of Christ through Mary. "Yours is an eminently Marian spirituality, not only because the Legion glories in carrying Mary's name as its unfurled banner, but above all because it bases its methods of spirituality and apostolate on the dynamic principle of union with Mary, on the truth of the intimate participation of the Virgin Mary in the plan of salvation. In other words you intend to render your service to every person, who is the image of Christ, with the spirit and the solicitude of Mary."