Sister Maria Faustina Kowalska was a young, uneducated, nun in a convent of the Congregation of Sisters of Our Lady of Mercy in Cracow, Poland during the 1930’s. She came from a very poor family that struggled on their little farm during the years of World War I. She had only three years of very simple education, so hers were the humblest tasks in the convent, usually in the kitchen or garden. However, she received extraordinary revelations or messages from Our Lord Jesus. Jesus asked Sr. Faustina to record these experiences, which she compiled in notebooks. These notebooks are known today as the Diary of Saint Maria Faustina Kowalska and the words contained within are God’s loving message of Divine Mercy.
Though the Divine Mercy message is not new to the teachings of the Church, Sr. Faustina’s Diary sparked a great movement, and a strong and significant focus on the mercy of Christ. Pope John Paul II canonized Sr. Faustina in 2000 making her the “first saint of the new millennium.” Speaking of Sr. Faustina and the importance of the message contained in her Diary, the Pope call her “the great apostle of Divine Mercy in our time.”–From The Divine Mercy Homepage, Marians of the Immaculate Conception.
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The following video is a wonderful explanation of this powerful devotion by Father Michael Gaitley.