The Divine Mercy Chaplet is a Catholic devotion that implores the Father’s mercy by invoking the merits Jesus has won for us through his redemptive Sacrifice of Calvary. The Chaplet of Divine Mercy is typically prayed using Catholic rosary beads. The prayers in the Divine Mercy Chaplet come from theDiary of St. Maria Faustina Kowalska, a Polish nun who received private revelations from Jesus in the 1930s. The Divine Mercy Novena is a nine-day prayer devotion that can be prayed any time of the year, but especially recommended by Jesus to begin on Good Friday and conclude on Divine Mercy Sunday, which is the second Sunday of Easter. ~ Catholic Answers