As a preparation for her mission Mary asked Saint Faustina to be faithful to the will of God, putting it ahead of all sacrifices and holocausts (Diary 1244). As her special and dearly beloved daughter, Mary asked that she practice the three virtues most dear to her and most pleasing to God.
The role that God gave Mary in this message of Divine Mercy was to prepare Faustina for her special mission by being an ever attentive Mother to her, guiding and teaching her about the life of union with God, and strengthening her in her sufferings, by suffering along with her in sympathy and compassion. Sister Faustina prayed to Mary from a very young age for help throughout her life.
“Speak to the world about His great mercy and prepare it for His Second Coming speak to souls about this great mercy while it is still the time of mercy.” These were the words of the Blessed Virgin to Sister Faustina when Mary appeared to her on March 25, 1936, the feast of the Annunciation.