St Louis de Montfort said to sinners: If you say faithfully the Rosary until death, I assure you, despite the gravity of your sins you will receive a “never fading crown of glory” [1 Pet 5:4]. Even if you are on the brink of damnation, even if you have one foot in hell, even if you have sold your soul to the devil as sorcerers do, and even if you are a heretic as obstinate as a devil, sooner or later you will be converted. You will amend your life and save your soul if you say the Holy Rosary devoutly, every day until death for the purpose of knowing the truth; and obtaining contrition and pardon for your sins. - St Louis de Montfort, “The Secret of the Rosary” source from Abbey-Roads blog