Here we discuss several important quotes taken from “True Devotion to The Blessed Virgin”.
In paragraph (5) St. Louis de Montfort states: “Mary is the supreme masterpiece of Almighty God and he has reserved the knowledge and possession of her for himself.” … “Mary is the sealed fountain and the faithful spouse of the Holy Spirit where only he may enter. She is the sanctuary and resting-place of the Blessed Trinity where God dwells in greater and more divine splendour than anywhere else in the universe.” …”No creature, however pure, may enter there without being specially privileged.
In paragraph (6) St. Louis de Montfort states: “I declare with the saints: Mary is the earthly paradise of Jesus Christ the new Adam, where he became man by the power of the Holy Spirit, in order to accomplish in her wonders beyond our understanding. She is the vast and divine world of God where unutterable marvels and beauties are to be found. She is the magnificence of the Almighty where he hid his only Son, as in his own bosom, and with him everything that is most excellent and precious.”
In paragraph (7), St. Louis de Montfort states: “The saints have said wonderful things of Mary, the holy City of God.”… “What incomprehensible height! What indescribable breadth! What immeasurable greatness! What an impenetrable abyss!”
In summary: The Virgin Mary is the supreme masterpiece of Almighty God, the faithful spouse of the Holy Spirit. The Virgin Mary is the sanctuary and resting-place of the Blessed Trinity where God dwells in greater and more divine splendor than anywhere else in the universe. She is the magnificence of the Almighty where he hid his only Son, as in his own bosom, and with him everything that is most excellent and precious.
In addition, the earthly paradise, the vast and divine world of God, the holy City of God resides in the Immaculate Heart of Mary.
In the Bible, the holy City of God is described in the book of the Apocalypse Chapter 21: “ And I saw a new heaven and a new earth. For the first heaven and the first earth was gone, and the sea is now no more.  And I John saw the holy city, the new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.”
Therefore since the Virgin Mary is the holy city of God, then she is also the new Jerusalem coming down out of heaven.
In the Bible, the sanctuary and resting-place of the Blessed Trinity is explained in the book of the Apocalypse 22: “And he shewed me a river of water of life, clear as crystal, proceeding from the throne of God and of the Lamb.  In the midst of the street thereof, and on both sides of the river, was the tree of life, bearing twelve fruits, yielding its fruits every month, and the leaves of the tree were for the healing of the nations.  And there shall be no curse any more; but the throne of God and of the Lamb shall be in it, and his servants shall serve him.  And they shall see his face: and his name shall be on their foreheads.  And night shall be no more: and they shall not need the light of the lamp, nor the light of the sun, because the Lord God shall enlighten them, and they shall reign for ever and ever.”
This Bible passage is referring to the holy city God, the new Jerusalem, coming down out of heaven from God. It specifically states that “the throne of God and of the Lamb shall be in it” and in addition, the Lord God shall be its light.
In addition, from the Catechism of the Catholic Church by St. John Paul II, paragraph (2502): “This spiritual beauty of God is reflected in the most holy Virgin Mother of God, the angels, and saints.”
Hence, since Mary’s Immaculate Heart is the new Jerusalem, we can now say that in Mary’s Immaculate Heart there is reflected the most pure light of the Divine Trinity where the throne of God and the Lamb resides in divine splendor.
In summary: God created Mary, His supreme masterpiece of perfection, to be the new Jerusalem and therefore all creation that is most excellent and precious is contained in her Immaculate Heart to give eternal praise with her to its Lord and Creator.
If you venerate Mary’s Immaculate Heart, you give praise to the Most Holy Trinity, which receives its greatest glory in it, because it has made of it, the holy City of God, the place of its divine delight.
In it God the Father is reflected with joy, the Word is placed therein as in a precious cradle, and the Holy Spirit burns with the purest light of his divine love.
In addition, St. Louis de Montfort states (50) part 7: ”Lastly, Mary must become as terrible as an army in battle array to the devil and his followers, especially in these latter times.”
This is mentioned in the Bible, in the Canticle of Canticles (Song of Solomon) 6:“ My beloved is gone down into his garden, to the bed of aromatical spices, to feed in the gardens, and to gather lilies.  I to my beloved, and my beloved to me, who feedeth among the lilies.  Thou are beautiful, O my love, sweet and comely as Jerusalem: terrible as an army set in array.” “ One is my dove, my perfect one is but one, she is the only one of her mother, the chosen of her that bore her. The daughters saw her, and declared her most blessed: the queens and concubines, and they praised her.  Who is she that cometh forth as the morning rising, fair as the moon, bright as the sun, terrible as an army set in array?”
Since the Virgin Mary is “as terrible as an army set in array” as pointed out by St. Louis de Montfort, then the Virgin Mary is being referred to as “my love”, “sweet and comely as Jerusalem”. This also means that “My Beloved” is God the Holy Spirit the Spouse of the Virgin Mary as shown in, Canticle of Canticle 5:1“Let my beloved come into his garden, and eat the fruit of his apple trees. I am come into my garden, O my sister, my spouse, I have gathered my myrrh, with my aromatical spices: I have eaten the honeycomb with my honey, I have drunk my wine with my milk: eat, O friends, and drink, and be inebriated, my dearly beloved.”
The “garden” that the Holy Spirit has entered into is the Holy City of God, the new Jerusalem, the heavenly garden because this is where his friends and dearly beloved will live forever. But we have previously indicated that Mary’s Immaculate Heart, is the earthly paradise, the divine world of God, the holy City of God, and the new Jerusalem.
Therefore, Mary’s Immaculate Heart is this heavenly garden.
In paragraph (25) St. Louis de Montfort states: “God the Holy Spirit entrusted his wondrous gifts to Mary, his faithful spouse, and chose her as the dispenser of all he possesses, so that she distributes all his gifts and graces to whom she wills, as much as she wills, how she wills and when she wills. No heavenly gift is given to men which does not pass through her virginal hands. Such indeed is the will of God, who has decreed that we should have all things through Mary, so that, making herself poor and lowly,, and hiding herself in the depths of nothingness during her whole life, she might be enriched, exalted and honoured by almighty God. Such are the views of the Church and the early Fathers.
Also in the Holy Gospel of St. Luke 1:  “And Mary said to the angel: How shall this be done, because I know not man?  And the angel answering, said to her: The Holy Ghost shall come upon thee, and the power of the most High shall overshadow. And therefore also the Holy which shall be born of thee shall be called the Son of God.”
In summary: The Holy Spirit is the only Gardener within the heavenly garden of Mary’s Immaculate Heart. He has overshadowed her with his light of love, filled her with all his gifts and has made her his Spouse.
In paragraph (5) St. Louis de Montfort states: “Mary is the sealed fountain and the faithful spouse of the Holy Spirit where only he may enter. No creature, however pure, may enter there without being specially privileged.”
The Virgin Mary is the faithful spouse of the Holy Spirit where only He may enter. Her garden is His exclusive property where He waters the flowers and gives them divine light. It is the Holy Spirit that causes the most beautiful flowers to spring up and gives them their color and aromatic fragrance.
No creature, however pure, may enter there without being specially privileged. It is the Holy Spirit who brings into His garden whom He wills. We must realize what a great gift we have received by consecrating ourselves to Mary’s Immaculate Heart!
In paragraph (148) St. Louis de Montfort states: “Mary presents our good works to Jesus. She does not keep anything we offer for herself, as if she were our last end, but unfailingly gives everything to Jesus. So by the very fact we give anything to her, we are giving it to Jesus. Whenever we praise and glorify her, she sings today as she did on the day Elizabeth praised her, "My soul glorifies the Lord."
In paragraph (225) St. Louis de Montfort states: “Lastly, you never think of Mary without Mary thinking of God for you. You never praise or honour Mary without Mary joining you in praising and honouring God.”
We should venerate the Virgin Mary’s Immaculate Heart because if you venerate Mary’s Heart, you give praise to the Most Holy Trinity, which receives its greatest glory in it, because it has made of this, her heavenly garden, the place of its divine delight.
If you venerate Mary’s Immaculate Heart, you also give praise to your heavenly Mother because within it is enfolded the mystery of her predilection and of the privileges of grace with which she has been adorned by God. And thus you also venerate her singular privileges of the Immaculate Conception, of the divine motherhood, of the bodily assumption into heaven, of the fullness of grace and of perpetual virginity. Enter into this heavenly garden by way of her heart so that you may understand and delight in the divine masterpiece which is your heavenly Mother.
If you love Mary’s Heart, you become clothed with her motherly love and her immaculate mercy. In the depths of her Immaculate Heart, there takes place the wonder which she accomplishes every day with you in order to make you ever more like herself and to transform your soul into the image of her own soul.
She also communicates her spirit to you in order that you may truly grow in her life and become, today, the expression of the presence of your heavenly Mother. She forms you in purity of mind, of heart and of body; and thus, you will spread about you the brightness of her immaculate light. She gives gentleness to your way of acting, so that you may be good and merciful to all.
If you offer reparation to the sorrow of Mary’s Immaculate Heart, you become a source of great joy and consolation for her, because through you she is able to take action in her secret plan. St. Louis de Montfort explains what this plan consists of:
157 “…Lastly, He who is deigned to come down to us who are not and turned our nothingness into God, or He who is. He did this perfectly by giving and submitting himself entirely to the young Virgin Mary, without ceasing to be in time He who is from all eternity. Likewise it is through Mary that we, who are nothing, may become like God by grace and glory. We accomplish this by giving ourselves to her so perfectly and so completely as to remain nothing, as far as self is concerned, and to be everything in her, without any fear of illusion.’”
Hence, St. Louis de Montfort states that Jesus Christ gave and submitted Himself entirely to the Virgin Mary. St. Louis de Montfort also explains what it means to give yourself entirely to Mary.
121. “This devotion consists in giving oneself entirely to Mary in order to belong entirely to Jesus through her. It requires us to give: (1) Our body with its senses and members; (2) Our soul with its faculties; (3) Our present material possessions and all we shall acquire in the future; (4) Our interior and spiritual possessions, that is, our merits, virtues and good actions of the past, the present and the future. ”
124. “It follows then that anyone who in this way consecrates and sacrifices himself voluntarily to Jesus through Mary may no longer dispose of the value of any of his good actions. All his sufferings, all his thoughts, words, and deeds belong to Mary. She can then dispose of them in accordance with the will of her Son and for his greater glory.”
St. Louis de Montfort states that Jesus Christ gave Himself entirely to the Virgin Mary by offering all of His sufferings to her which includes His suffering on the Cross. Mary’s presence at the foot of the Cross shows us that Jesus desired to unite the Mother of God completely to all of His great sufferings at the time of His passion and death for us.
St. Louis de Montfort is saying that the pain of the Immaculate Heart of Mary was the altar on which Jesus offered to the Father the Sacrifice of the new and eternal Covenant. By Jesus Christ offering to His Father all of His sufferings through and with the Virgin Mary and by Mary offering her Son freely to the Father, she became true Co-redemptrix.
This is why in 1985, Pope John Paul II recognized Mary as co-redemptrix" during a speech in Guayaquil, Ecuador. He said, in part, "Having suffered for the Church, Mary deserved to become the Mother of all the disciples of her Son, the Mother of their unity...In fact Mary’s role as Co-redemptrix did not cease with the glorification of her Son.”: “Inside the Vatican," 1997-JUL, Page 23; as cited in Reference 3.
Jesus is the only Redeemer because He alone is the mediator between God and men. However, by God’s Will, we who have been redeemed can co-operate with Him in His redemptive work as St. Paul explains to the Colossians, 1:24: “Who now rejoice in my sufferings for you, and fill up those things that are wanting of the sufferings of Christ, in my flesh, for his body, which is the church.”
The Virgin Mary is the perfect model of our co-operation in the redemptive work accomplished by Jesus Christ.
In paragraph 175, St. Louis de Montfort states that at the time of Noah, immediately before the flood, those whom the Lord destined to survive his terrible chastisement entered into the ark.
175. “Blessed, indeed, are those Christians who bind themselves faithfully and completely to her as to a secure anchor! The violent storms of the world will not make them founder or carry away their heavenly riches. Blessed are those who enter into her as into another Noah's ark!”
Hence, in these times, the Blessed Virgin Mary is inviting all her beloved children to enter into the Ark of the New Covenant which she has built in her Immaculate Heart for us, that we may be assisted by her to carry the bloody burden of the great trial that precedes the coming of the day of the Lord.
The Virgin Mary is Mediatrix of all Graces as explained by St. Louis de Montfort:
25. “God the Holy Spirit entrusted his wondrous gifts to Mary, his faithful spouse, and chose her as the dispenser of all he possesses, so that she distributes all his gifts and graces to whom she wills, as much as she wills, how she wills and when she wills. No heavenly gift is given to men which does not pass through her virginal hands. Such indeed is the will of God, who has decreed that we should have all things through Mary, so that, making herself poor and lowly,, and hiding herself in the depths of nothingness during her whole life, she might be enriched, exalted and honoured by almighty God. Such are the views of the Church and the early Fathers.”
In addition, whatever the Virgin Mary asks for, she obtains because Jesus can never say no to what she requests from Him as St. Louis de Montfort explains. Hence, the Mother of God is suppliant omnipotence.
27. “Since grace enhances our human nature and glory adds a still greater perfection to grace, it is certain that our Lord remains in heaven just as much the Son of Mary as he was on earth. Consequently he has retained the submissiveness and obedience of the most perfect of all children towards the best of all mothers. We must take care, however, not to consider this dependence as an abasement or imperfection in Jesus Christ. For Mary, infinitely inferior to her Son, who is God, does not command him in the same way as an earthly mother would command her child who is beneath her. Since she is completely transformed in God by that grace and glory which transforms all the saints in him, she does not ask or wish or do anything which is contrary to the eternal and changeless will of God. When therefore we read in the writings of Saint Bernard, Saint Bernardine, Saint Bonaventure, and others that all in heaven and on earth, even God himself, is subject to the Blessed Virgin, they mean that the authority which God was pleased to give her is so great that she seems to have the same power as God. Her prayers and requests are so powerful with him that he accepts them as commands in the sense that he never resists his dear mother's prayer because it is always humble and conformed to his will.”
Consecration to the Immaculate Heart of Mary is imperative in order to enter the Kingdom of God as St. Louis de Montfort explains. Which means, if you had not consecrated yourself to the Immaculate Heart of Mary while living on earth, you will do so in purgatory.
39. “Secondly, we must conclude that, being necessary to God by a necessity which is called "hypothetical", (that is, because God so willed it), the Blessed Virgin is all the more necessary for men to attain their final end. Consequently we must not place devotion to her on the same level as devotion to the other saints as if it were merely something optional.”
40. “The pious and learned Jesuit, Suarez, Justus Lipsius, a devout and erudite theologian of Louvain, and many others have proved incontestably that devotion to our Blessed Lady is necessary to attain salvation.”
Next we will explain the Virgin Mary’s secret plan.
47. “I said that this will happen especially towards the end of the world, and indeed soon, because Almighty God and his holy Mother are to raise up great saints who will surpass in holiness most other saints as much as the cedars of Lebanon tower above little shrubs. This has been revealed to a holy soul whose life has been written by M. de Renty.”
48. “These great souls filled with grace and zeal will be chosen to oppose the enemies of God who are raging on all sides. They will be exceptionally devoted to the Blessed Virgin. Illumined by her light, strengthened by her food, guided by her spirit, supported by her arm, sheltered under her protection, they will fight with one hand and build with the other. With one hand they will give battle, overthrowing and crushing heretics and their heresies, schismatics and their schisms, idolaters and their idolatries, sinners and their wickedness. With the other hand they will build the temple of the true Solomon and the mystical city of God, namely, the Blessed Virgin, who is called by the Fathers of the Church the Temple of Solomon and the City of God. By word and example they will draw all men to a true devotion to her and though this will make many enemies, it will also bring about many victories and much glory to God alone. This is what God revealed to St. Vincent Ferrer, that outstanding apostle of his day, as he has amply shown in one of his works. This seems to have been foretold by the Holy Spirit in Psalm 58: "The Lord will reign in Jacob and all the ends of the earth. They will be converted towards evening and they will be as hungry as dogs and they will go around the city to find something to eat." This city around which men will roam at the end of the world seeking conversion and the appeasement of the hunger they have for justice is the most Blessed Virgin, who is called by the Holy Spirit the City of God.”
Now that we know that Psalm 58 refers to the City of God, which is the Immaculate Heart of Mary, let us read Psalm 58 starting at verse 12: “Scatter them by thy power; and bring them down, O Lord, my protector:  For the sin of their mouth, and the word of their lips: and let them be taken in their pride. And for their cursing and lying they shall be talked of,  When they are consumed: when they are consumed by thy wrath, and they shall be no more. And they shall know that God will rule Jacob, and all the ends of the earth.  They shall return at evening and shall suffer hunger like dogs: and shall go round about the city.  They shall be scattered abroad to eat, and shall murmur if they be not filled.  But I will sing thy strength: and will extol thy mercy in the morning. For thou art become my support, and my refuge, in the day of my trouble.  Unto thee, O my helper, will I sing, for thou art God my defense: my God my mercy.”
To summarize paragraph 48 by St. Louis de Montfort, God by His Divine Mercy has provided a refuge for His children, Mary’s Immaculate Heart, the City of God, into which all must now enter to escape God’s wrath. We must all enter immediately into the safe refuge of Mary’s Immaculate Heart!
Jesus Christ is forming HIs City, the City of God, by means of the powerful action of the Holy Spirit and in the garden of the Immaculate Heart of Mary. It is the new Jerusalem, the new Church of Light, which has a splendor greater than a thousand suns! It is being formed in the hearts of the simple, of the little, of the pure, of the poor, of those who know how to receive and follow Jesus Christ with perfect docility, without any compromise with the spirit of the world. Jesus Christ is building His new Church in a way that is invisible and utterly mysterious in silence, in hiddenness, in prayer, in simplicity as the Bible points out:
Gospel of St. Luke 17:  “And being asked by the Pharisees, when the kingdom of God should come? he answered them, and said: The kingdom of God cometh not with observation:  Neither shall they say: Behold here, or behold there. For lo, the kingdom of God is within you.”
St. Louis also explains that In the “latter times” the Most Holy Trinity has entrusted to the Immaculate Heart of May the task of preparing the Church and all humanity to live with confidence the hour of the great tribulation, which prepares you for the glorious return of Christ as explained in paragraph 50.
(50) “In these latter times Mary must shine forth more than ever in mercy, power and grace; in mercy, to bring back and welcome lovingly the poor sinners and wanderers who are to be converted and return to the Catholic Church”.
So what does it mean to be consecrated?
As explained in our catechism, when a person is consecrated, they are being called by God to render Him perfect worship and are removed from all uses other than the sacred one they have been assigned. Therefore, your true act of consecration is that of baptism. By this sacrament instituted by Jesus Christ, grace is communicated to you placing you in an order of life higher than your own natural life, that is to say, the supernatural life. Through this sacrament you enter into a communion of love with God and your actions now have a value that exceeds human nature because they have a value which is truly divine.
After a person is baptized, they are able to give perfect glorification to the Most Holy Trinity and are now consecrated to live in the love of the Father, in the imitation of the Son, and in full communion with the Holy Spirit.
St. Louis de Montfort reveals that consecration to the Blessed Virgin is the perfect renewal of the vows and promises of holy baptism:
73. “… Before we were baptised we were the slaves of the devil, but baptism made us the slaves of Jesus. Christians can only be slaves of the devil or slaves of Christ.
120. “As all perfection consists in our being conformed, united and consecrated to Jesus it naturally follows that the most perfect of all devotions is that which conforms, unites, and consecrates us most completely to Jesus. Now of all God's creatures Mary is the most conformed to Jesus. It therefore follows that, of all devotions, devotion to her makes for the most effective consecration and conformity to him. The more one is consecrated to Mary, the more one is consecrated to Jesus. That is why perfect consecration to Jesus is but a perfect and complete consecration of oneself to the Blessed Virgin, which is the devotion I teach; or in other words, it is the perfect renewal of the vows and promises of holy baptism.”
When the Virgin Mary asks you for the consecration to her Immaculate Heart, it is to make you understand that you must completely entrust yourselves to her, in a total and everlasting way, that she may dispose of you according to the Will of God.
The fact that characterizes the act of consecration is its totality: when you are consecrated you are then wholly so, and forever! You must entrust yourselves in a manner that is complete, giving her everything; you should not give her one thing and hold on to another, for yourselves; you should truly be wholly hers. And then you should entrust yourselves to her not on one day yes and on another day no, or for a period of time, but forever!
As St. Louis de Montfort says:
101 “…Because of their fickleness they are unworthy to be included among the servants of the Virgin most faithful, because faithfulness and constancy are the hallmarks of Mary's servants. It is better not to burden ourselves with a multitude of prayers and pious practices but rather adopt only a few and perform them with love and perseverance in spite of opposition from the devil the world and the flesh.”
For example, say frequently throughout the day and especially each time you start a new task, this prayer fashioned after paragraphs 257 and 259 by St. Louis de Montfort: “Mary, I renounce my own spirit, my own view, and my own will, and I give myself up entirely to you, to be moved and directed as you wish.”
It is to emphasize this important aspect of a complete and lasting dedication to your heavenly Mother that she asks for the consecration to her Immaculate Heart.
So, why should we be consecrated to the Immaculate Heart of Mary? St. Louis de Montfort explains this in paragraph 243:
243 “Loving slaves of Jesus in Mary should hold in high esteem devotion to Jesus, the Word of God, in the great mystery of the Incarnation, March 25th, which is the mystery proper to this devotion, because it was inspired by the Holy Spirit.”
Hence, to understand why the Mother of God is asking us to consecrate ourselves to her Immaculate Heart, we need to consider the ineffable moment of the Annunciation made by the Archangel Gabriel, sent by God to receive Mary’s yes for the realization of his eternal plan of redemption and for the great mystery of the Incarnation of the Word in Mary’s virginal womb.
The Word of the Father was entrusted completely to her, in love. After her yes, He came down into her virginal womb.
He was entrusted to her in his divinity. The Eternal Word, Second Person of the Most Holy Trinity, after the incarnation, was received and hidden in the tiny dwelling, miraculously prepared by the Holy Spirit, of her virginal womb.
He was entrusted to her in his humanity, in a manner as profound as the way any son is entrusted to the mother, from whom everything is expected: blood, flesh, breath, food, love to enable him to grow in her womb each day, and then, after birth, each year, always close to the mother.
And Mary is intimately associated with her Son Jesus: She collaborates with Him in his work of salvation, during his infancy, his adolescence, his thirty years of hidden life at Nazareth, his public ministry; during his sorrowful passion and up to the Cross where she offered and suffered with Him, receiving his last words of love and sorrow, in which she is given to humanity as true Mother.
We must imitate Jesus Christ in his complete reliance on his heavenly Mother. For this reason, Mary asks you to offer yourselves to her with your consecration. She will be an attentive Mother for you, concerned to make you grow in God’s plan, to realize in your lives the vocation you have been called. She will bring you each day to an ever better imitation of Jesus, who must be your only model and your greatest love. You will be true instruments, faithful collaborators in his redemption.
When you suffer, Mary suffers. When you rejoice, Mary rejoices. When you are good and you love her, she jumps for joy!
When you consecrate yourself to Mary’s Immaculate Heart you are hers, you belong to her. At every moment you must be just as she would have you be; at every moment you must do just what she would have you do. Do not be afraid, she will always be near you! She will prepare you for great things, but little by little as a mother does with her child. Remain ever close to her Heart in prayer. Nothing else should be of interest or importance to you save living with her and for her.
You will then see how all things of this world appear remote and hazy to you; how everything wearies and bores you; everything else that is not Mary your Mother, who wants you whole and entire at every moment with her. Learn to let yourself be possessed by her, so that, in everything you do, it will be her who is doing it through you. It is so necessary that it be the Mother who acts; and she wants to act through you. You will have to suffer more, but courage! Mary will always be with you and you will delight as no one else in the sweetness of her motherly Heart!
Only in Mary’s Immaculate Heart is the source of your security. Here you are trained by Mary in prayer, because this is the weapon with which you must fight. Pray more. Pray always. Every action of yours must truly be a prayer. Recite the holy rosary with love and joy.
In Mary’s Immaculate Heart you are being helped by her to suffer. And now, the cradle of Mary’s Immaculate Heart becomes an altar, upon which she immolates you each day, in order to appease divine justice and that the mercy of God may descend, like a rain, to renew the world. Here you are, above all, being formed by Mary to the perfection of love. She wants to love with your heart, to gaze with your eyes, to console and encourage with your lips, to assist with your hands, to walk with your feet, to follow your bloodied footprints and to suffer with your crucified body.
In paragraph 144, St. Louis de Montfort states that St. John the Apostle was consecrated to Mary.
(144) “…Just as one who is consecrated belongs entirely to Mary, so Mary belongs entirely to him. We can truthfully say of this perfect servant and child of Mary what St. John in his gospel says of himself, "He took her for his own."
St. Louis de Montfort is specifically saying that St. John the apostle consecrated himself to the Virgin Mary at the moment when Jesus said in the Gospel of St. John 19:26 “When Jesus therefore had seen his mother and the disciple standing whom he loved, he saith to his mother: Woman, behold thy son.  After that, he saith to the disciple: Behold thy mother. And from that hour, the disciple took her to his own.”
St. Louis de Montfort also says that in the latter times there will be “great saints” who will be consecrated to the Immaculate Heart of Mary and so they will be in the spirit of St. John the Apostle as explained in the following paragraphs.
(35) “…Together with the Holy Spirit Mary produced the greatest thing that ever was or ever will be: a God-man. She will consequently produce the marvels which will be seen in the latter times. The formation and the education of the great saints who will come at the end of the world are reserved to her, for only this singular and wondrous virgin can produce in union with the Holy Spirit singular and wondrous things.”
(57) “They will be like thunder-clouds flying through the air at the slightest breath of the Holy Spirit. Attached to nothing, surprised at nothing, troubled at nothing, they will shower down the rain of God's word and of eternal life. They will thunder against sin, they will storm against the world, they will strike down the devil and his followers and for life and for death, they will pierce through and through with the two-edged sword of God's word all those against whom they are sent by Almighty God.”
This explains why Jesus said to St. Peter that he will have St. John remain until he returns because the “great saints” of the latter years will be consecrated to the Immaculate Heart of Mary just as St. John the apostle was.
Gospel of St. John 21:21 “Him therefore when Peter had seen, he saith to Jesus: Lord, and what shall this man do?  Jesus saith to him: So I will have him to remain till I come, what is it to thee? follow thou me.  This saying therefore went abroad among the brethren, that that disciple should not die. And Jesus did not say to him: He should not die; but, So I will have him to remain till I come, what is it to thee?  This is that disciple who giveth testimony of these things, and hath written these things; and we know that his testimony is true.”
Also St. John the Apostle was told that he “must prophesy again” in the Apocalypse 10:11 “And he said to me: Thou must prophesy again to many nations, and peoples, and tongues, and kings.”
Also in the Gospel of St. Matthew 16:28 "Amen I say to you, there are some of them that stand here, that shall not taste death, till they see the Son of man coming in his kingdom."
As well in the Gospel of St. Mark 8:39 "And he said to them: Amen I say to you, that there are some of them that stand here, who shall not taste death, till they see the kingdom of God coming in power."
And in the Gospel of St. Luke 9:27 “But I tell you of a truth: There are some standing here that shall not taste death, till they see the kingdom of God.” Hence, all who are consecrated to the Immaculate Heart of Mary are in the spirit of St. John the Apostle.