In a vision, Jesus dictated the Chaplet to Saint Mary Faustina Kowalska in 1935. To pray the Chaplet, use rosary beads and begin with these prayers:
On the large (Our Father) bead of each decade, pray:
"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 (Hail Mary) beads of each decade, pray:
"For the sake of His sorrowful passion, have mercy on us and on the whole world."
After five decades to conclude, pray three times:
"Holy God, Holy Mighty One, Holy Immortal One, have mercy on us and on the whole world."
You may wish to add (three times):
"Jesus, I trust in You."
You may wish to add these prayers:
Optional Opening Prayers:
"You expired, Jesus, but the source of life gushed forth for souls, and the ocean of mercy opened up for the whole world. O Fount ot Life, unfathomable Divine Mercy, envelop the whole world and empty Yourself out upon us."
"O Blood and Water, which gushed forth from the Heart of Jesus as a fountain of mercy for us, I trust in You!"
Optional Closing Prayer:
"Eternal God, in whom mercy is endless and the treasury of compassion inexhaustible, look kindly upon us and increase Your mercy in us, that in dificult moments we might not despair nor become despondent, but with great confidence submit ourselves to Your holy will, which is Love and Mercy itself. Amen."