So the devotion is based on the three Hail Mary devotion which is already highly recommended by many Saints and is powerful!
One of the first to say the three Hail Marys and to recommend them to others was the illustrious St. Anthony of Padua. His special aim in this practice was to honor the spotless Virginity of Mary and to preserve a perfect purity of mind, heart and body in the midst of the dangers of the world. Many, like him, have felt its salutary effects.
Later on, St. Leonard of Port-Maurice, the celebrated missionary, had the three Ave Marias recited morning and evening in honor of Mary Immaculate, to obtain the grace of avoiding all mortal sins during the day or and night; moreover, he promised in a special manner eternal salvation to all those who proved constantly faithful to this practice.
After the example of these two great Franciscan Saints, St. Alphonsus Liguori adopted this pious practice and gave it his most ardent and powerful support. He counseled its use and even imposed it as a penance on those who had not adopted this good habit. The holy Doctor exhorts, in particular, parents, and confessors to watch carefully that children be faithful in reciting each day their three Hail Marys, morning and evening and recommended it to all the devout young or old.
This practice has been revealed to St. Melchtilde with the promise of a good death, if she was faithful to it every day.
Now we take the devotion and apply it into our daily lives whenever we are in need of something such as being late in traffic or having a test in school that you are worried about. Pray the three Hail Mary's and when you get the favored result you pray another three Hail Mary's in thanksgiving. Thus you have your Three and Three Hail Mary's.
Please leave your testimonials below for favors granted,
God Bless you
The Rosary Doctor