St John Paul II, canonised today, was a great advocate of associating this Sunday with the divine mercy. Here are some words from a sermon of his on the subject:
In the Messiah, crucified and risen, we recognize the features of the Lamb sacrificed on Golgotha, who implores forgiveness for His torturers and opens the gates of heaven to repentant sinners; we glimpse the face of the immortal King who now has "the keys of Death and Hades" (Rev 1:18).
Give thanks to the Lord, for He is good; for His mercy endures forever! (Ps 117:1). Let us make our own the Psalmist's exclamation which we sang in the Responsorial Psalm: "The Lord's mercy endures forever!" In order to understand thoroughly the truth of these words, let us be led by the liturgy to the heart of the event of salvation, which unites Christ's Death and Resurrection with our lives and with the world's history. This miracle of mercy has radically changed humanity's destiny. It is a miracle in which is unfolded the fullness of the love of the Father who, for our redemption, does not even draw back before the sacrifice of His Only-begotten Son.