The document describes the Chaplet of Divine Mercy, a prayer revealed to Saint Faustina Kowalska by Jesus. It involves praying the Our Father, Hail Mary, and Apostle's Creed followed by decades of prayers for mercy for oneself and the whole world. Jesus promised Saint Faustina that anyone who recites the Chaplet, even the hardest of sinners, will receive great mercy, especially at the hour of death.