Blood and water
Yes, it belongs on this Sunday.
It's about God's forgiveness.
What were two of the five last words of Christ?
"Father, forgive them for they know not what they do."
"Today you will be with me in paradise." (to the good thief)
What is the main theme of this Sunday's readings?
"Receive the Holy Spirit, whose sins you shall forgive they are forgiven them, and whose sins you shall retain are retained."
Don't you see the pattern? It's about the most joyous gift of Christ's death on the Cross -- His gift of forgiveness.
It's a penitential devotion that disrupts the celebration of the Risen Christ, not Christ crucified.
It belongs maybe in Lent or some other Sunday, not during the Paschal season.
You expired, Jesus, but the source of life gushed forth for souls and the ocean of mercy opened up for the whole world. O Fountain of Life, unfathomable Divine Mercy, envelop the whole world and empty Yourself out upon us.
O Blood and Water, which gushed forth from the Heart of Jesus as a fountain of mercy for us, I trust in You.