St. Louis de Montfort!

Louis-Marie Grignion de Montfort (31 January 1673 – 28 April 1716) was a French Roman Catholic priest and confessor. He was known in his time as a preacher and was made a missionary apostolic by Pope Clement XI.
As well as preaching, Montfort found time to write a number of books which went on to become classic Catholic titles and influenced several popes. Montfort is known for his particular devotion to the Blessed Virgin Mary and the practice of praying the rosary.
Montfort is considered one of the notable writers in the field of Mariology. His most notable works regarding Marian devotions are contained in Secret of the Rosary and True Devotion to Mary.
The Roman Catholic Church, under the pontificate of Pope Pius XII, canonized Montfort on 20 July 1947. A "founders statue" created by Giacomo Parisini is located in an upper niche of the south nave of St. Peter's Basilica.
He was born in 1673 in Montfort-sur-Meu, the eldest surviving child of eighteen born to Jean-Baptiste and Jeanne Robert Grignion. His father was a notary. Louis-Marie passed most of his infancy and early childhood in Iffendic, a few kilometers from Montfort, where his father had bought a farm. At the age of 12, he entered the Jesuit College of St Thomas Becket in Rennes, where his uncle was a parish priest.
At the end of his ordinary schooling, he began his studies of philosophy and theology, still at St Thomas in Rennes. Listening to the stories of a local priest, the Abbé Julien Bellier, about his life as an itinerant missionary, he was inspired to preach missions among the very poor. Bellier was propagating among his students a consecration and entrustment to Mary. Under the guidance of Bellier and other priests, de Montfort began to develop his strong devotion to the Blessed Virgin Mary.
19th century depiction of St Sulpice where Montfort had earlier studied for the priesthood
He was then given the opportunity, through a benefactor, to go to Paris to study at the renowned Seminary of Saint-Sulpice towards the end of 1693. When he arrived in Paris, it was to find that his benefactor had not provided enough money for him, so he lodged in a succession of boarding houses, living among the very poor, in the meantime attending the Sorbonne University for lectures in theology. After less than two years, he became very ill and had to be hospitalized, but survived his hospitalization and the blood letting that was part of his treatment at the time.
Upon his release from the hospital, to his surprise he found himself with a place reserved at the Little Saint-Sulpice, which he entered in July 1695. Saint-Sulpice had been founded by Jean-Jacques Olier, one of the leading exponents of what came to be known as the French school of spirituality. Given that he was appointed the librarian, his time at Saint-Sulpice gave him the opportunity to study most of the available works on spirituality and, in particular, on the Virgin Mary's place in the Christian life. This later led to his focus on the Holy Rosary and his acclaimed book the Secret of the Rosary.
Even as a seminarian in Paris, Montfort was known for the veneration he had toward the angels: he "urged his confreres to show marks of respect and tenderness to their guardian angels." He often ended his letters with a salutation to the guardian angel of the person to whom he was writing: "I salute your guardian angel". He also saluted all the angels in the city of Nantes, a custom that, it appears, he repeated when he entered a new village or city.
One of the reasons why Montfort had such devotion to the angels is that veneration of the pure spirits was an integral part of his training and also of his culture. His college teachers, the Jesuits, were known for their zeal in propagating devotion to the angels. Montfort's seminary training under the Sulpicians brought him into contact with the thought of Cardinal de Bérulle and Olier, both of whom had deep veneration for the angels. Furthermore, in the course of the seventeenth and eighteenth centuries, manuals of piety and treatises on the pure spirits were numerous.
Total Consecration to Jesus through Mary
In Montfort's approach to Marian consecration, Jesus and Mary are inseparable. He views "consecration to Jesus in Mary" as a special path to being conformed to, united and consecrated to Christ, given that
" ...of all creatures the one most conformed to Jesus Christ, it follows that among all devotions that which most consecrates and conforms a soul to our Lord is devotion to Mary, his Holy Mother, and that the more a soul is consecrated to her the more will it be consecrated to Jesus Christ.
"God the Father made an assemblage of all the waters, and He named it the sea (mare). He has made an assemblage of all His graces, and He has called it Mary (Maria).
Montfort's process of Total Consecration has seven elements and effects: knowledge of one's unworthiness, sharing in Mary's faith, the gift of pure love, unlimited confidence in God and Mary, communication of the Spirit of Mary, transformation into the likeness of Jesus, and bringing more glory to Christ. Montfort's practice of consecration to Mary has both internal and external components. The internal components focus on surrendering oneself as a slave to Mary and to Jesus through her, and performing all actions "with Mary, in Mary, through Mary and for Mary". The suggested exterior practices include enrolment in Marian societies, or joining Marian religious orders, making Marian privileges known and appreciated, and giving alms in honor of Mary.
Louis de Montfort influenced a number of popes.
In the 19th century, Pope Pius IX considered it the best and most acceptable form of Marian devotion, while Pope Leo XIII granted indulgences for practicing Montfort's method of Marian consecration. Leo beatified Montfort in 1888, selecting for Montfort's beatification the day of his own Golden Jubilee as a priest.
In the 20th century Pope Pius X acknowledged the influence of Montfort's writings in the composition of his encyclical Ad diem illum.
Pope Pius XI stated that he had practiced Montfort's devotional methods since his early youth. Pope Pius XII declared Montfort a saint and stated that Montfort is the guide "who leads you to Mary and from Mary to Jesus.
Pope John Paul II once recalled how as a young seminarian he "read and reread many times and with great spiritual profit" a work of de Montfort and that: "Then I understood that I could not exclude the Lord's Mother from my life without neglecting the will of God-Trinity. According to his Apostolic Letter Rosarium Virginis Mariae, the pontiff's personal motto was "Totus Tuus." The thoughts, writings, and example of Louis de Montfort were also singled out by Pope John Paul II's encyclical Redemptoris Mater as a distinctive witness of Marian spirituality in the Roman Catholic tradition.
While Montfort is best known for his spiritual writings, he was also a poet and during his missions managed to compose more than 20,000 verses of hymns. Montfort's hymns and canticles were, for the most part, meant to be sung in village churches and in the homes of the poor. Some authors argue that a reading of Montfort's hymns is essential for an understanding of him as a man and for appreciating his approach to spirituality.
Based on the analysis of Bishop Hendrik Frehen of the Company of Mary, Montfortian hymns fall into two major categories: "inspired" and "didactic." The inspired canticles flow spontaneously, on the occasion of a pilgrimage to a Marian shrine, or on the occasion of a joyful celebration. The didactic hymns took more effort and time to compose, and focus on instructional and informative qualities: they teach the audience through the use of a moral and a theme. After Montfort's death, the Company of Mary (which continued his work of preaching parish renewals) made great use of his hymns and used them as instruments of evangelization.
He is also said to have carved at least three statues depicting the Madonna and Child.