The simplest Marian devotion has quite the history
Pious practice: FROM: https://www.olrl.org/pray/threehms.shtml
Practice: Recite morning and evening, three Hail Marys in honor of the three great privileges bestowed upon Our Blessed Mother by the most Blessed Trinity with this invocation at the end: for the morning: “O my Mother preserve me from mortal sin during this day.” For the evening: “O my Mother preserve me from mortal sin during this night.”
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