The first task in the school of St. Faustina’s spirituality is coming to know God in the mystery of His Mercy. The Apostle of Divine Mercy did it first by very simple means, such as meditation of the Word of God, spiritual reading, listening to conferences, reflecting on the mysteries of the rosary and the stations of the way of the cross, participating in days of recollection and retreats, profoundly experiencing the holy sacraments, the solemnities of the Church throughout the liturgical year. Not only did she come to know the mystery of Divine Mercy on the ground of the Holy Scriptures, Liturgy of the Church…, but she also tried to perceive the signs of His love in her own life. In daily check of conscience she asked: what has God done for me today? Such knowing the mystery of Divine Mercy caused that the mystery of God’s love was not abstract, something beautiful yet unattainable or out of reach; rather, it takes on concrete forms in the ordinary life of man.
In doing so, Sister Faustina saw that her entire life was immersed in the mercy of God. In it my soul bathes daily…, she wrote, There is not a moment in my life when do not experience Your mercy (Diary 697). It is like the golden thread running through our life, which maintains in good order the contact of our being with God. … My senses are transfixed with joy, she admitted sincerely, when God grants me a deeper awareness of that great attribute of His; namely, His unfathomable mercy (Diary 1466). Sister Faustina realised very clearly that the knowledge of the mystery of Divine Mercy is not attained by one’s own efforts alone but that the work of the human intellect must be strengthened by divine grace. Thus, she pleaded, O My Jesus, give me wisdom, give me a mind great and enlightened by Your light, and this only, that I may know You better, O Lord. For the better I get to know You, the more ardently I will love You (Diary 1030; cf. Diary 1474).
Sister Faustina noticed also that it is possible to come to know God, not only by the intellect, but by the practise of love of neighbour, too. I have learned and experienced, she ascertained in the Diary, that souls living in love are distinguished in this: that they are greatly enlightened concerning the things of God, both in their own souls and in the souls of others. And simple souls, without an education, are outstanding for their knowledge (Diary 1191).
Such coming to know God in the life of Sister Faustina was strenghtened by the gift of acquired contemplation and through it she penetrated very deeply this mystery of our faith in order to let it know to the world. Through her records saved in the Diary we can know God better in the mystery of His merciful love towards man.