The extraordinary visions of this humble Polish nun gave rise to The Divine Mercy devotion which has become increasingly popular among Catholics today. Who was Sister Faustina H. Kowalska (1905-1938)? In this authorized biography, you will encounter the young woman, born Helena, and her family, and read of many other people who inﬂuenced her spiritual formation. Sister Faustina’s devotion to the Lord and her tireless efforts to promulgate the messages she received from Him and from Our Lady have borne rich fruit, and continue to touch the lives of millions around the World. This biography, formerly titled Mercy My Mission, includes many excerpts from Faustina’s famous Diary. Whether read alone or as a study aid to reading the diary itself, this book is an inspiring and reliable introduction to this remarkable twentieth-century saint.