The Diary of Saint Maria Faustina Kowalska - Divine Mercy in My Soul is the book that sparked the Divine Mercy movement. The Diary chronicles God's message given through St. Faustina to the world to turn to His mercy. In it, we are reminded to trust the Divine Mercy in Jesus and seek His forgiveness. As Christ is merciful, so, too, are we instructed to be merciful to others.

The message of Divine Mercy has become an integral part of life, including the celebration of the Feast of Divine Mercy on the Sunday after Easter.