Jesus entrusted the great mission of Divine Mercy to a simple Polish nun, Sr. Maria Faustina Kowalska. The young mystic grew deeply in holiness through perseverance and continual communing with Jesus, ultimately achieving union with her Divine Lord. She worked tirelessly to carry out every detail of her mission and had to be patient with the endless delays she faced throughout her efforts. Particular sources of difficulty were, for example, getting the Divine Mercy Image painted, the Divine Mercy message propagated, and the Feast established (Diary, 47-51).

Jesus depended on His little daughter, His “Secretary of Mercy,” and told Sr. Faustina that the “graces of My mercy are drawn by means of one vessel only, and that is — trust. The more a soul trusts, the more it will receive” (Diary, 1578). This faithful nun learned to deeply trust Jesus and His holy will for her. She surrendered her life wholeheartedly to Him and even delighted in every single bit she needed to suffer to bring about God’s will.