As we are indebted to Christ for sharing in some way with us the right, which is peculiarly His own, of calling God our Father and possessing Him as such, we are in like manner indebted to Him for His loving generosity in sharing with us the right to call Mary our Mother and to cherish her as such. While nature itself made the name of mother the sweetest of all names and has made motherhood the very model of tender and solicitous love, no tongue is eloquent enough to put in words what every devout soul feels, namely how intense is the flame of affectionate and active charity which glows in Mary, in her who is truly our mother not in a human way but through Christ.
Nobody knows and comprehends so well as she everything that concerns us: what helps we need in life; what dangers, public or private, threaten our welfare; what difficulties and evils surround us; above all, how fierce is the fight we wage with ruthless enemies of our salvation. In these and in all other troubles of life her power is most far-reaching. Her desire to use it is most ardent to bring consolation, strength, and help of every kind to children who are dear to her. Accordingly, let us approach Mary confidently, wholeheartedly beseeching her by the bonds of her motherhood which unite her so closely to Jesus and at the same time to us. Let us with deepest devotion invoke her constant aid in the prayer which she herself has indicated and which is most acceptable to her. Then with good reason shall we rest with an easy and joyous mind under the protection of the best of mothers.
Leo XIII, Magnae Dei Matris, On the Rosary and the Honor of Mary (September 8, 1892).