>> You who read this, whosoever you may be, resolve to say the following little prayer every morning and evening: "O Holy and Immaculate Virgin Mary, offer to the Eternal Father the Precious Blood of thy Divine Son for the intention that one mortal sin may be prevented this day (or this night)."
[One mortal sin averted, for the glory of God.]

Taken from DEVOTION TO THE PRECIOUS BLOOD (TAN Books and Publishers)