In 1931 Our Lord and Savior Jesus Christ appeared to Sister Faustina (now Saint Faustina) and instructed her to " Paint an image according to the pattern you see, with the inscription: Jesus I trust in You!". Later, Jesus told her "The pale ray stands for the Water which makes souls righteous; the red ray stands for the Blood which is the life of souls. These two rays issued forth from the depths of My most tender Mercy at the time when My agonizing Heart was opened by a lance on the Cross. . . Fortunate is the one who will dwell in their shelter, for the just hand of God shall not lay hold on him."
Divine Mercy Sunday
As a further sign of Divine Mercy Jesus instructed her "I want this image to be solemnly blessed on the first Sunday after Easter; that Sunday is to be the Feast of Mercy. On that day, the depths of My Mercy will be open to all. Whoever will go to confession and Holy Communion on that day will receive complete forgiveness of sin and punishment. Mankind will not enjoy peace until it turns with confidence to My Mercy."