Diary of St. Faustina
30 + On one occasion I was reflecting on the Holy Trinity, on the essence of God. I absolutely wanted to know and fathom who God is. … In an instant my spirit was caught up into what seemed to be the next world. I saw an inaccessible light, and in this light what appeared like three sources of light which I could not understand. And out of that light came words in the form of lightning which encircled heaven and earth. Not understanding anything, I was very sad. Suddenly, from this sea of inaccessible light came our dearly beloved Savior, unutterably beautiful with His shining Wounds. And from this light came a voice which said, Who God is in His Essence, no one will fathom, neither the mind of Angels nor of man. Jesus said to me, Get to know God by contemplating His attributes. A moment later, He traced the sign of the cross with His hand and vanished.
699 On one occasion, I heard these words: My daughter, tell the whole world about My inconceivable mercy. I desire that the Feast of Mercy be a refuge and shelter for all souls, and especially for poor sinners. On that day the very depths of My tender mercy are open. I pour out a whole ocean of graces upon those souls who approach the Fount of My Mercy. The soul that will go to Confession and receive Holy Communion shall obtain complete forgiveness of sins and punishment. On that day all the divine floodgates through which graces flow are opened. Let no soul fear to draw near to Me, even though its sins be as scarlet. My mercy is so great that no mind, be it of man or of angel, will be able to fathom it throughout all eternity. Everything that exists has come forth from the very depths of My most tender mercy. Every soul in its relation to Me will contemplate My love and mercy throughout eternity. The Feast of Mercy emerged from My very depths of tenderness. It is My desire that it be solemnly celebrated on the first Sunday after Easter. Mankind will not have peace until it turns to the Fount of My Mercy.
1074 When I went for adoration, I heard these words: My beloved daughter, write down these words, that today My Heart has rested in this convent [the Cracow house]. Tell the world about My mercy and My love. The flames of mercy are burning me. I desire to pour them out upon human souls. Oh, what pain they cause Me when they do not want to accept them! My daughter, do whatever is within your power to spread devotion to My mercy. I will make up for what you lack. Tell aching mankind to snuggle close to My merciful Heart, and I will fill it with peace. Tell [all people], My daughter, that I am Love and Mercy itself. When a soul approaches Me with trust, I fill it with such an abundance of graces that it cannot contain them within itself, but radiates them to other souls.
1345 + Fourth day. O Jesus, I have been feeling extraordinarily well, close to Your Heart, during this retreat. Nothing disturbs the depths of my peace. With one eye, I gaze on the abyss of my misery and with the other, on the abyss of Your mercy.
1520 Today the Lord said to me, I have opened My Heart as a living fountain of mercy. Let all souls draw life from it. Let them approach this sea of mercy with great trust. Sinners will attain justification, and the just will be confirmed in good. Whoever places his trust in My mercy will be filled with My divine peace at the hour of death.
Scripture
Matthew 6:21
21 For where your treasure is, there will your heart be also.
John 14:27
27 Peace I leave with you; my peace I give to you; not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid.
Catechism of Catholic Church
III. The Conversion of the Baptized
1427 Jesus calls to conversion. This call is an essential part of the proclamation of the kingdom: “The time is fulfilled, and the kingdom of God is at hand; repent, and believe in the gospel.” In the Church’s preaching this call is addressed first to those who do not yet know Christ and his Gospel. Also, Baptism is the principal place for the first and fundamental conversion. It is by faith in the Gospel and by Baptism that one renounces evil and gains salvation, that is, the forgiveness of all sins and the gift of new life.
1428 Christ’s call to conversion continues to resound in the lives of Christians. This second conversion is an uninterrupted task for the whole Church who, “clasping sinners to her bosom, [is] at once holy and always in need of purification, [and] follows constantly the path of penance and renewal.” This endeavor of conversion is not just a human work. It is the movement of a “contrite heart,” drawn and moved by grace to respond to the merciful love of God who loved us first.
1429 St. Peter’s conversion after he had denied his master three times bears witness to this. Jesus’ look of infinite mercy drew tears of repentance from Peter and, after the Lord’s resurrection, a threefold affirmation of love for him. The second conversion also has a communitarian dimension, as is clear in the Lord’s call to a whole Church: “Repent!”
St. Ambrose says of the two conversions that, in the Church, “there are water and tears: the water of Baptism and the tears of repentance.”
IV. Interior Penance
1430 Jesus’ call to conversion and penance, like that of the prophets before him, does not aim first at outward works, “sackcloth and ashes,” fasting and mortification, but at the conversion of the heart, interior conversion. Without this, such penances remain sterile and false; however, urges expression in visible signs, gestures and works of penance.