The Feast of the Divine Mercy or Divine Mercy Sunday falls on the Octave of Easter (the Sunday immediately following Easter)[1]. It is dedicated to the devotion to the Divine Mercy promoted by St. Faustina, and is based upon an entry in St. Faustina's diary stating that anyone who participates in the Mass and receives the sacraments of confession and Eucharist on this day is assured by Jesus of full remission of sins.