Every great saint has a strong devotion to the Blessed Virgin Mary, but arguably no other saint has written about the Mother of God with such clarity and beauty as one particular holy individual.
Saint Dominic might be the OG expert on the Rosary and Saint JPII is great too.
But IMHO Saint Louis de Montfort is the GOAT Mariologist.
I learned about his books during a Marian consecration. True Devotion to Mary and The Secret of the Rosary are required items on your bookshelf. Re-re-reading both books have become a yearly tradition for me.
Everything you need to know about the Rosary is contained in this theologically-rich book—The Secret of the Rosary.
Who else has read this amazing spiritual work?
“[Mary] is the safest, easiest, shortest and most perfect way of approaching Jesus and will surrender themselves to her, body and soul, without reserve in order to belong entirely to Jesus.” — St. Louis de Montfort