On the Second Sunday of Easter of the Jubilee Year 2000, at the Mass for the canonization of St. Faustina Kowalska, Pope John Paul II proclaimed to the world that “from now on throughout the Church this Sunday will be called Divine Mercy Sunday.” Pope John Paul had actively promoted the message of St. Faustina. In his 1980 encyclical on God’s mercy, Rich in Mercy, he developed a scriptural and doctrinal basis for our faith in the mercy of God. By linking the revealed truth about God’s mercy to one of the most solemn Sundays after Easter itself, he illumined the fact that the liturgy already proclaimed the divine mercy. The truth has been embedded for two millennia in the worship of the Church. Once again we see an illustration of the ancient saying, “The law of faith is the law of prayer.”
On the Second Sunday of Easter, the responsorial psalm and Gospel for Cycles A, B and C center on the theme of mercy. In Psalm 118 we sing three times, “His mercy endures forever.” The Gospel, from John 20:19-31, begins with the risen Christ appearing to the apostles on Easter night. Jesus calms his disciples by saying and giving them “Peace.” He shows them the scars of his Passion, his wounded hands and side. His glorified body retains the evidence of his saving work through his suffering, death and resurrection. He fills them with joy and again says to them—and produces in them—“Peace.” Then he breathes on them and explains what the divine breathing means with the words, “Receive the holy Spirit. Whose sins you forgive are forgiven them, and whose sins you retain are retained.” He gives the apostles the power of God’s mercy for the sinner, the gift of forgiving sins from God’s treasury of mercy. The other texts speak of healing and give the assurance there is nothing to fear.
You might have seen the image of Jesus standing with one hand outstretched in blessing, the other clutching the side wounded by the spear, from which proceed beams of falling light, red and white in color. An explanation of these colors was given to Sister Faustina by Jesus himself saying, "The two rays represent blood and water."
[7] This has been attributed to the "blood and water" referenced in the
Gospel of John, (
John 19:34) and which is also mentioned in the optional of the Chaplet. The words “Jesus I Trust in Thee” He gave her a chaplet to be recited and said that it was appropriate to pray the chaplet at three o'clock each afternoon (the Hour of Great Mercy).