Today, in the 1962 Dominican Rite Calendar, we celebrate the feast of the Blessed Virgin Mary - Mediatrix of All Graces. The feast is III Class, so the Ordinary Office is prayed. Like many III Class feasts in the Dominican Breviary, this office contains the a significant amount of beautiful propers, as if the feast were II Class. At Lauds, the Psalms of Sunday are prayed.
May is the month of Mary, our blessed Lady and Mother of God. Today we celebrate a wonderful Marian feast, with a beautiful Office. It honors our Blessed Lady's role in the salvation of mankind as mother of our Savior, and recognizes her universal mediation in the dispensing of all graces that come to us from Our Lord Jesus Christ. In his encyclical Octobri Mense (On the Rosary, September 22, 1891), Pope Leo XIII declared "We may affirm that nothing, by the will of God, is given to us without Mary's mediation, in such way that just as no one can approach the almighty Father but through His Son, like wise no one, so to speak, can approach Christ but through His Mother".