The Chaplet of Mercy with audio and offline to hear at the time Mercy
This third was taught in a vision that Sister Faustina had on September 13, 1935: "I saw an Angel, the executor of God's anger, about to hit the earth. I started begging intensely to God for the world with words heard interiorly. As we just prayed, I saw that the angel was helpless, and could no longer perform the just punishment. "

The next day, an inner voice he taught this prayer in the rosary.