I have a strong objection to the Feast of the Divine Mercy's replacement of Low Sunday on the Roman Calendar because it disrupts the paschal season.
The Paschal Season is a season of joy and commemoration of Christ's victory over death. It's not a time for the penitential self-flagellation of the Divine Mercy chaplet.
If it belongs anywhere on the Roman Calendar, its during Lent, not Pascha.
That's not to mention that all of the Popes between Pius XI and Paul VI suppressed the Divine Mercy cult as spurious.
http://www.divinewill.org/Biographies%20-%20Biography%20of%20Luisa%20by%20Fr.%20Sanguiao.htm
I pray that some future pope will have the foresight to suppress it. I am glad that Byzantine Catholics do not celebrate it publicly.
Happy Low Sunday:
http://www.breviary.net/propseason/easter/propseasoneast1.htm
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.