From childhood, Catholics learn about praying to Mary. In the Hail Mary, we praise her and we ask her to pray for us. But there is another dimension. Legionaires pray not only TO Mary, but also WITH Mary. The Official Handbook of the Legion of Mary teaches that as we pray, ”Have her before the mind, at least in some small way, all all times. Unite the intention and the will to hers in such fashion that every act done during the day, every prayer you utter, is done with herL. She should be left out of nothing. Whether you pray to the Father, or to theSon, or to the Holy Spirit, or to a saint, it is always to be prayer in union with Mary She repeats the words with you. Her lips and your lips form the words together, and in everything she has a part. Thus, she is far more than at your side She is, as it were, in you; your life is you and she together giving God all you jointly have.
(Cf. THE OFFICIAL HANDBOOK OF THE LEGION OF MARY, Chapter 39, p. 281 et seq)