Today Jesus said to me, I desire that you know more profoundly the love that burns in My Heart for souls, and you will understand this when you meditate upon My Passion. Call upon My mercy on behalf of sinners; I desire their salvation. When you say this prayer, with a contrite heart and with faith on behalf of some sinner, I will give him the grace of conversion.
This is the prayer: (Diary, 186).
“O Blood and Water, which gushed forth from the Heart of Jesus as a fount of Mercy for us, I trust in You.”
My Mercy on Behalf of Sinners
Devotion to the souls in Purgatory contains in itself all the works of mercy, which supernaturalized by a spirit of faith, should merit us Heaven. de Sales