St. Faustina recounts that Jesus asked not only for a Feast of Divine Mercy, which the Servant of God, Pope John Paul II declared during his pontificate (and ironically died on two years ago on April 2nd--the Feast is movable, this year will be celebrated on April 15th), but also that Our Lord asked that a novena (nine days of prayer) to be prayed by the faithful starting on Good Friday and ending on the Feast of Divine Mercy (the Second Sunday of Easter).
I explain the history of this novena as well as include the prayers for it in The Church's Most Powerful Novenas. Thankfully, you can now search inside this book to sample not only that novena, but other unique novenas such as Mother Teresa's "express or quick novena"--when you don't have nine days to wait for an answer (like all the novenas in the book the history behind it is also included).
The Divine Mercy Novena is a beautiful way to begin the Easter season by reflecting upon the great love that God has for us, expressed by Jesus on the cross. The prayers dictated to St. Faustina by Jesus--express His love for all of us for whom He died and reminds us that none of us, no matter how far we think we have fallen are outside of the reach of His love, forgiveness--His Mercy.