St. Maria Faustina Kowalska was a Polish nun who committed her life to spreading devotion to God's Divine Mercy, as famously described in her Diary. Through her Christ communicated to the world to trust in his infinite mercy for the salvation of sinners. The famous Divine Mercy painting was patterned after one of her visions of Christ along with the prayers of the Divine Mercy chaplet.
St. Faustina was a Polish born nun. She was asked to become the apostle and secretary of God's mercy, a model of how to be merciful to others, and an instrument for reemphasizing God's plan of mercy for the world. Her entire life, in imitation of Christ's, was to be a sacrifice - a life lived for others. She wrote and suffered in secret, with only her spiritual director and some of her superiors aware that anything special was taking place in her life.