In 1965 the then Archbishop of Cracow, Karol Wojtyla, asked Fr. Ignacy Różycki to prepare a critical analysis of the Diary and letters of Sister Faustina as part of the Informative Process concerning her life and virtues. The results of his research were written in French: a massive tome of 500 pages which was presented to the Vatican as part of the official investigation into Sr. Faustina?s life by the Congregation for the Causes of Saints. The essay “Essential Features of the Devotion to the Divine Mercy” by Fr. Różycki is a compendium of the principal elements of his main work for the Apostolic See on St. Faustina’s writings. As such it represents a summary of the most thorough theological analysis ever written on the Divine Mercy message and devotion as revealed to the world through St. Sister Faustina Kowalska. Therefore, we would like to encourage all the apostles of Divine Mercy to refer to this publication.