With these considerations being quite limited, the information below will add much to understanding and implementing the Devotion to Divine Mercy.
A good preparation for Divine Mercy Sunday is praying the Divine Mercy chaplet:
As for the history and development of Devotion view:
You expired, O Jesus, but the source of life gushed forth for souls and an ocean of mercy opened up for the whole world. O Fount 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 fount of mercy for us, I trust in You. Amen