This third lesson was taught during a vision Sister Faustina had on September 13, 1935: "I saw an angel, the executor of God's wrath, even to the point of reaching the earth, I began to implore God for the world with words I heard inwardly, as I prayed thus, I saw that the angel was forsaken and could no longer simply carry out the punishment."

The next day an inner voice taught him this prayer in the beads of the rosary.

"By reciting this rosary, I like to give all that is required of me. When hardened sinners recite it, I will fill their souls with peace, and their hour of death will be happy. Write this to troubled souls: When the soul sees and recognize the gravity of your sins, when the whole abyss of misery into which you plunged is revealed, do not despair, but let yourself be thrown with confidence into the arms of my mercy, Like a child in the arms of its dear mother These souls have over my merciful heart a right of way We say that no soul who has turned to My mercy has been disappointed or felt irritation.”

"When they pray this rosary with the dying, I will stand between the Father and the dying soul, not as a just judge, but as a merciful Savior."

The Rosary also includes the contemplation of certain passages from the life of Jesus and his mother Mary, which, according to the doctrine of the Catholic Church, are of particular relevance to the history of salvation and are called "mysteries".
The rosary was traditionally divided into three equal parts, with fifty pearls each and which, as they corresponded to the third part, were called a rosary.