For God's mecry endures forever
“For his mercy endures forever.” - Psalm 136
This is the refrain that repeats after each verse in Psalm 136 as it narrates the history of God’s revelation...
Mercy renders God’s history with Israel a history of salvation. To repeat continually “for his mercy endures forever,” as the psalm does, seems to break through the dimensions of space and time, inserting everything into the eternal mystery of love. It is as if to say that not only in history, but for all eternity man will always be under the merciful gaze of the Father. It is no accident that the people of Israel wanted to include this psalm – the “Great Hallel,” as it is called – in its most important liturgical feast days.
Before his Passion, Jesus prayed with this psalm of mercy. Matthew attests to this in his Gospel when he says that, “when they had sung a hymn” (26:30), Jesus and his disciples went out to the Mount of Olives. While he was instituting the Eucharist as an everlasting memorial of himself and his paschal sacrifice, he symbolically placed this supreme act of revelation in the light of his mercy. Within the very same context of mercy, Jesus entered upon his passion and death, conscious of the great mystery of love that he would consummate on the Cross. Knowing that Jesus himself prayed this psalm makes it even more important for us as Christians, challenging us to take up the refrain in our daily lives by praying these words of praise: “for his mercy endures forever.”
Pope Francis, The face of the Father's mercy, 2015