This prayer was dictated to Sister Faustina by Lord Jesus in Vilnius year 1935. In the following apparitions, her revealed its value and efficiency, and explained the related promise.
In this prayer, we sacrifice to God the Father “Body and Blood, Soul and Divinity” of Jesus Christ, we merge with his sacrifice on the cross for the salvation of the world.
When we give God the Father, his “beloved Son”, we refer to the strongest reason to be heard. We ask, have mercy on us and on the whole world.”
The word “Us” refers to the person praying the rosary and to those to whom he wishes or feels obliged to pray. “The whole world” – this is all of humanity that lives on earth and the souls suffering in purgatory.
Specific promises relating to the last hour: the grace of happy and peaceful death. Say unceasingly the chaplet that I have taught you. Whoever will recite it will receive great mercy at the hour of death. Priests will recommend it to sinners as their last hope of salvation. Even if there were a sinner most hardened, if he were to recite this chaplet only once, he would receive grace from My infinite mercy. I desire that the whole world know My infinite mercy. I desire to grant unimaginable graces to those souls who trust in My mercy. (687)
What the Lord Jesus said to Sister Faustina shows how great the graces attached to this prayer are: By saying the chaplet you are bringing humankind closer to Me (Diary 929). The Lord Jesus attached great promises to this prayer provided that the conditions of the correct devotion to the Divine Mercy are met, that is, the spirit of trusting God and being merciful towards neighbour is required.
Perseverance in praying is an expression of this trust; the greater the trust is, the greater the perseverance in saying the Chaplet of Divine Mercy is. The Lord Jesus said to Sister Faustina that by saying the Chaplet of Divine Mercy one can obtain everything.
However, apart from the grace of a good death, He has never claimed that everything can be obtained immediately, having said the prayer once.
The Lord Jesus attached a promise of obtaining all graces to the Chaplet of Divine Mercy said with trust – He said: It pleases Me to grant everything they [people] ask of Me by saying the chaplet (Diary 1541), adding: if (…) [it] is compatible with My will (Diary 1731). God’s will is an expression of His love for man, thus everything that is not compatible with it is either bad or harmful.
Apart from the general promise, there are promises that concern the hour of death, and to be more precise: the grace of a happy and peaceful death, in other words, death in the state of grace and without experiencing fear and terror. These graces can be obtained not only by those who say the Chaplet of Divine Mercy with trust themselves but also the dying by whose bedside others will say this prayer.
At least once, but in the mood, which is consistent with the content of prayer, especially in faith, trust and humility and with sincere and deep regret of our sins.
To pray the Chaplet of Divine Mercy use an ordinary rosary.
How to pray Chaplet of Divine Mercy
Begin with: Our Father, who art in heaven, hallowed be Thy name; Thy kingdom come; Thy will be done on earth as it is in heaven. Give us this day our daily bread; and forgive us our trespasses as we forgive those who trespass against us; and lead us not into temptation, but deliver us from evil. Amen.
Hail Mary, full of grace, the Lord is with thee; blessed art thou among women, and blessed is the fruit of thy womb, Jesus. Holy Mary, Mother of God, pray for us sinners, now and at the hour of our death. Amen.
I believe in God, the Father Almighty, Creator of heaven and earth; and in Jesus Christ, His only Son, our Lord; who was conceived by the Holy Spirit, born of the Virgin Mary, suffered under Pontius Pilate, was crucified, died, and was buried. He descended into hell; the third day He arose again from the dead; He ascended into heaven, sits at the right hand of God, the Father Almighty; from thence He shall come to judge the living and the dead. I believe in the Holy Spirit, the Holy Catholic Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and life everlasting. Amen.
On the ﬁve large beads:
Eternal Father, I offer You the Body and Blood, Soul and Divinity of Your dearly beloved Son, Our Lord Jesus Christ, in atonement for our sins and those of the whole world.
On the ten small beads:
For the sake of His sorrowful Passion, have mercy on us and on the whole world.
Conclude with (3 times):
Holy God, Holy Mighty One, Holy Immortal One, have mercy on us and on the whole world.