From St. Faustina's Diary:
Fourth DaySay the Chaplet of Divine Mercy.
1216 [Jesus:] Today bring to Me the pagans and those who do not yet know me. I was thinking also of them during My bitter Passion, and their future zeal comforted My Heart. Immerse them in the ocean of My mercy.
1217 [St. Faustina:] Most Compassionate Jesus, You are the Light of the whole world. Receive into the abode of Your Most Compassionate Heart the souls of pagans who as yet do not know You. Let the rays of Your grace enlighten them that they, too, together with us, may extol Your wonderful mercy; and do not let them escape from the abode which is Your Most Compassionate Heart.
May the light of Your love
Enlighten the souls in darkness;
Grant that these souls will know You
And, together with us, praise Your mercy.
Eternal Father, turn Your merciful gaze upon the souls of pagans and of those who as yet do not know You, but who are enclosed in the Most Compassionate Heart of Jesus. Draw them to the light of the Gospel. These souls do not know what great happiness it is to love You. Grant that they, too, may extol the generosity of Your mercy for endless ages. Amen.