… The doctrine of the universal mediation of Mary [of St. Louis de Montfort] had struck him and he was convinced that that doctrine is the source of life. He was determined to draw out of the Marian mediation its apostolic consequences. With contagious ardor he explained to the members assembled there that a sincere devotion toward Mary must be active: it obliges us to work for Mary, to help her save the souls for whom she had suffered so much.
A century after St. Louis de Montfort, Blessed William Joseph Chaminade (1761-1850) would present this doctrine in the more appealing language of filial commitment to Mary. In the twentieth century Mary’s apostolic mission and our participation in it would be popularized by Marianist Father Emile Neubert S.M., with whom Frank Duff had extensive correspondence.[The Marianists were founded by Bl. William Chaminade.]
From:Legion of Mary, History and Overview
MARY’S LEGION: A Bird’s Eye View of the Legion of Mary
– by Brother John M. Samaha, S.M.