The Mercy of God devotion encouraged by the mystical experiences of St. Faustina is not a new doctrine but a focusing of the human consciousness on a truth of God's revelation with a deeper insight, understanding and willingness to plead for God's mercy realizing the need for atonement for our sins. Note: Mercy implies an awareness of God's justice, a justice which demands that we make up for the punishment our sins deserve.
Begin by reciting the Our Father, Hail Mary and the Apostles' Creed. And using the rosary beads continue.
CONCLUDING DOXOLOGY (3x)
Holy God
Holy Mighty One,
Holy Immortal One,
have mercy on us
and the holy world.