If the Grace the Lord offers sounds like the blessings of a plenary indulgence, it is because the remission of ALL punishment due to sin is exactly what a plenary indulgence accomplishes. While a private revelation is not obliged by Faith, so that no one would be dissuaded from approaching the fount of Divine Mercy on Divine Mercy Sunday by that argument, Pope St. John Paul II established it by an act of papal authority, creating a Plenary Indulgence, accessible to Catholics in all circumstances. DIVINE MERCY INDULGENCE   Also known as the Secretary of Divine Mercy, St. Faustina Kowalska was a Polish nun with the Congregation of the Sisters of Our Lady of Mercy. She began to have visions of Jesus in 1931, writing them down in her spiritual journal, now titled Divine Mercy in My Soul, and often referred to simply as Diary. From this beginning the apostolate and devotion of Divine Mercy began.