Three saints are invoked in the closing prayers
Saint Peter is the prince of the apostles. It is appropriate for an apostolic organization like the Legion of Mary to ask for his prayers. By invoking Saint Peter in the Legionary prayers we express our loyalty to the Pope.
Saint Paul's mission was to convert the world. We follow in his footsteps. He appreciates our work and understands our difficulties. We can count on him.
Saint John the Baptist, Saints Peter, and Paul, pray for us.