The stated mission is for active members to serve God under the banner of Mary by practicing the Corporal and spiritual Works of Mercy as mentioned in chapter 33 of the Legion of Mary Handbook. The main apostolate of the Legion consists in activities directed towards Catholics and non-Catholics encouraging them in their faith or inviting them to become Catholic. This is done through encouraging them in prayer, attending Mass and learning more about the Catholic faith. The members of the Legion are primarily engaged in the performance of the Spiritual Works of Mercy.