"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:
O Blood and Water, which gushed forth from the Heart of Jesus as a fount of mercy for us, I trust in You."  WORDS OF JESUS TO ST. FAUSTINA   (Diary 186)