The Divine Mercy
During the course of Jesus' revelations to Saint Faustina on the Divine Mercy He asked on numerous occasions that a feast day be dedicated to the Divine Mercy and that this feast be celebrated on the Sunday after Easter. The liturgical texts of that day, the 2nd Sunday of Easter, concern the institution of the Sacrament of Penance, the Tribunal of the Divine Mercy, and are thus already suited to the request of Our Lord. This Feast, which had already been granted to the nation of Poland and been celebrated within Vatican City, was granted to the Universal Church by Pope John Paul II on the occasion of the canonization of Sr. Faustina on 30 April 2000. In a decree dated 23 May 2000, the Congregation for Divine Worship and the Discipline of the Sacraments stated that "throughout the world the Second Sunday of Easter will receive the name Divine Mercy Sunday, a perennial invitation to the Christian world to face, with confidence in divine benevolence, the difficulties and trials that mankind will experience in the years to come." These papal acts represent the highest endorsement that the Church can give to a private revelation, an act of papal infallibility proclaiming the certain sanctity of the mystic, and the granting of a universal feast, as requested by Our Lord to St. Faustina. Concerning the Feast of Mercy Jesus said to Saint Faustina: “My daughter, tell the whole world about My Inconceivable mercy. I desire that the Feast of Mercy be a refuge and shelter for all souls, and especially for poor sinners. On that day the very depths of My tender mercy are open. I pour out a whole ocean of graces upon those souls who approach the fount of My mercy. The soul that will go to Confession and receive Holy Communion shall obtain complete forgiveness of sins and punishment. On that day all the divine floodgates through which grace flow are opened. Let no soul fear to draw near to Me, even though its sins be as scarlet. My mercy is so great that no mind, be it of man or of angel, will be able to fathom it throughout all eternity. Everything that exists has come forth from the very depths of My most tender mercy. Every soul in its relation to Me will contemplate My love and mercy throughout eternity. The Feast of Mercy emerged from My very depths of tenderness. It is My desire that it be solemnly celebrated on the first Sunday after Easter. Mankind will not have peace until it turns to the Fount of My Mercy.”
(These notes are taken from EWTN.)