Our Lady of Mercy takes a special place in the school of St. Faustina’s spirituality. Sister Faustina took the devotion to Our Lady from family home, but in her religious life it deepened significantly. It was fostered not only by the spirituality of the Congregation, whose main Patroness is Our Lady of Mercy, but also by a very personal contact with Mary. In numerous apparitions, visions, meetings Mary revealed to Sister Faustina the mystery of the Divine Mercy in her life, she taught her, strengthened, accompanied in her prophetic mission. I am Mother to you all, thanks to the unfathomable mercy of God (Diary 449), said Mary, I am not only the Queen of Heaven, but also the Mother of Mercy and your Mother (Diary 330).
For Sister Faustina, Mary was above all the Mother of God’s Son – Mercy Incarnate and out of God’s mercy also the mother of every man. As a careful and the best mother and the Mistress of spiritual life, she taught her the contemplation of God in her soul, obedience to the will of God, the art of love of the cross and care for these virtues, which condition the attitude of trust in God and mercy towards neighbours. I saw the Mother of God, Sister Faustina noted, who said to me, «Oh, how pleasing to God is the soul that follows faithfully the inspirations of His grace! I gave the Saviour to the world; as for you, you have to speak to the world about His great mercy and prepare the world for the Second Coming of Him who will come, not as a merciful Saviour, but as a just Judge. Oh, how terrible is that day! Determined is the day of justice, the day of divine wrath. The angels tremble before it. Speak to souls about this great mercy while it is still the time for mercy. If you keep silent now, you will be answering for a great number of souls on that terrible day. Fear nothing. Be faithful to the end. I sympathise with you» (Diary 635).
When the Congregation chose Mary for the Heavenly Superior General (15 August 1937), Sister Faustina envisioned all sisters covered by Her coat and heard the words of a great promise, «Everyone who perseveres zealously till death in My Congregation will be spared the fire of purgatory, and I desire that each one distinguish herself by the following virtues: humility and meekness; chastity and love of God and neighbour; compassion and mercy». After these words words, the whole Congregation disappeared from my sight, and I remained alone with the Most Holy Mother who instructed me about the will of God and how to apply it to my life, submitting completely to His most holy decrees. It is impossible for one to please God without obeying His holy will. «My daughter, I strongly recommend that you faithfully fulfil all God’s wishes, for that is most pleasing in His holy eyes. I very much desire that you distinguish yourself in this faithfulness in accomplishing God’s will. Put the will of God before all sacrifices and holocausts» (Diary 1244).