Consecration to the Immaculate Heart of Mary by St. Louis - with Oldest Litany to Our Lady and Prayers

Act of Consecration to Jesus through Mary
O ETERNAL and incarnate Wisdom! O sweetest and most adorable Jesus! True God and true man, only Son of the Eternal Father, and of Mary, always virgin! I adore Thee profoundly in the bosom and splendors of Thy Father during eternity; and I adore Thee also in the virginal bosom of Mary, Thy most worthy Mother, in the time of Thine incarnation. I give Thee thanks for that Thou hast annihilated Thyself, taking the form of a slave in order to rescue me from the cruel slavery of the devil. I praise and glorify Thee for that Thou hast been pleased to submit Thyself to Mary, Thy holy Mother, in all things, in order to make me Thy faithful slave through her.
But, alas! Ungrateful and faithless as I have been, I have not kept the promises which I made so solemnly to Thee in my Baptism; I have not fulfilled my obligations; I do not deserve to be called Thy child, nor yet Thy slave; and as there is nothing in me which does not merit Thine anger and Thy repulse, I dare not come by myself before Thy most holy and august Majesty. It is on this account that I have recourse to the intercession of Thy most holy Mother, whom Thou hast given me for a mediatrix with Thee. It is through her that I hope to obtain of Thee contrition, the pardon of my sins, and the acquisition and preservation of wisdom. Hail, then, O immaculate Mary, living tabernacle of the Divinity, where the Eternal Wisdom willed to be hidden and to be adored by angels and by men! Hail, O Queen of Heaven and earth, to whose empire everything is subject which is under God. Hail, O sure refuge of sinners, whose mercy fails no one. Hear the desires which I have of the Divine Wisdom; and for that end receive the vows and offerings which in my lowliness I present to thee.
 I, ________________, a faithless sinner, renew and ratify today in thy hands the vows of my Baptism; I renounce forever Satan, his pomps and works; and I give myself entirely to Jesus Christ, the Incarnate Wisdom, to carry my cross after Him all the days of my life, and to be more faithful to Him than I have ever been before. In the presence of all the heavenly court I choose thee this day for my Mother and Mistress. I deliver and consecrate to thee, as thy slave, my body and soul, my goods, both interior and exterior, and even the value of all my good actions, past, present and future; leaving to thee the entire and full right of disposing of me, and all that belongs to me, without exception, according to thy good pleasure, for the greater glory of God in time and in eternity.
Receive, O benignant Virgin, this little offering of my slavery, in honor of, and in union with, that subjection which the Eternal Wisdom deigned to have to thy maternity; in homage to the power which both of you have over this poor sinner, and in thanksgiving for the privileges with which the Holy Trinity has favored thee. I declare that I wish henceforth, as thy true slave, to seek thy honor and to obey thee in all things.
O admirable Mother, present me to thy dear Son as His eternal slave, so that as He has redeemed me by thee, by thee He may receive me! O Mother of mercy, grant me the grace to obtain the true Wisdom of God; and for that end receive me among those whom thou lovest and teachest, whom thou leadest, nourishest and protectest as thy children and thy slaves. O faithful Virgin, make me in all things so perfect a disciple, imitator and slave of the Incarnate Wisdom, Jesus Christ thy Son, that I may attain, by thine intercession and by thine example, to the fullness of His age on earth and of His glory in Heaven. Amen. (By: St. Louis Marie Gringnon de Montfort - from "The True Devotion to Mary")

Litany of  Our Lady - Loreto 

V. Lord, have mercy.
R. Christ have mercy.
V. Lord have mercy. Christ hear us.
R. Christ graciously hear us.
God the Father of heaven, have mercy on us.
God the Son, Redeemer of the world, have mercy on us.
God the Holy Spirit, have mercy on us. 
Holy Trinity, one God, have mercy on us.
Holy Mary, pray for us. 
Holy Mother of God, pray for us. 
Holy Virgin of Virgins, [etc.]
Mother of Christ,
Mother of divine grace,
Mother most pure,
Mother most chaste,
Mother inviolate,
Mother undefiled,
Mother most amiable,
Mother most admirable,
Mother of good Counsel,
Mother of our Creator,
Mother of our Savior,
Virgin most prudent,
Virgin most venerable,
Virgin most renowned,
Virgin most powerful,
Virgin most merciful,
Virgin most faithful,
Mirror of justice,
Seat of wisdom,
Cause of our joy,
Spiritual vessel,
Vessel of honor,
Singular vessel of devotion,
Mystical rose,
Tower of David,
Tower of ivory,
House of gold,
Ark of the covenant,
Gate of heaven,
Morning star,
Health of the sick,
Refuge of sinners,
Comforter of the afflicted,
Help of Christians,
Queen of Angels,
Queen of Patriarchs,
Queen of Prophets,
Queen of Apostles,
Queen of Martyrs,
Queen of Confessors,
Queen of Virgins,
Queen of all Saints,
Queen conceived without original sin,
Queen assumed into heaven,
Queen of the most holy Rosary,
Queen of families,
Queen of peace,
V. Lamb of God, Who takest away the sins of the world,
R. Spare us, O Lord. 
V. Lamb of God, Who takest away the sins of the world,
R. Graciously hear us, O Lord. 
V. Lamb of God, Who takest away the sins of the world,
Have mercy on us.
V. Pray for us, O holy Mother of God.
R. That we may be made worthy of the promises of Christ.
Let us pray. Grant, we beseech Thee, O Lord God, that we thy servants may enjoy perpetual health of mind and body, and by the glorious intercession of blessed Mary, ever Virgin, may we be freed from present sorrow, and rejoice in eternal happiness. Through Christ our Lord. R. Amen.
The versicle and prayer after the litany may be varied by season. Thus, during Advent (from the fourth Sunday before Christmas to Christmas Eve):
V. The Angel of the Lord declared unto Mary.
R. And she conceived by the Holy Spirit.
Let us pray. O God, who hast willed that by the message of an Angel, thy Word should receive flesh from the womb of the Virgin Mary: grant unto thy suppliants, that we who believe that she is truly the Mother of God, may be assisted by her intercession before Thee. Through the same Christ our Lord. R. Amen.
From Christmas to Candlemass (the Feast of the Presentation), that is through February 1:
V. Thou gavest birth without loss of thy virginity.
R. Intercede for us, O holy Mother of God.
Let us pray. O God, Who by the fruitful virginity of blessed Mary hast offered unto the human race the rewards of eternal salvation, grant, we beseech thee, that we may know the effects of her intercession, through whom we have deserved to receive the author of life, our Lord Jesus Christ, Thy Son. R. Amen.
From Candlemass to Easter (through Holy Week), AND from the day after Pentecost (or from Trinity Sunday, if Pentecost is celebrated with octave) to the beginning of Advent:
V. "Pray for us" and prayer "Grant unto thy servants," as above:
During Eastertide (from Easter day through Pentecost, and throughout the octave of Pentecost if it is celebrated):
V. Rejoice and be glad, O Virgin Mary, alleluia.
R. For the Lord is truely risen, alleluia.
Let us pray. O God, Who by the resurrection of Thy Son, our Lord Jesus Christ, hast vouchsafed to make glad the whole world, grant, we beseech Thee, that through the intercession of the Virgin Mary, His mother, we may attain the joys of eternal life, through the same Christ our Lord. R. Amen.

The Magnificat - Sung by Mary at the Visitation

The Magnificat is a canticle of the Blessed Virgin from the Gospel of Luke Also known as the Song of Mary:

My soul magnifies the Lord; my spirit has found joy in God my Saviour,
Because he has looked graciously upon the lowliness of his handmaid.
Behold, from this day forward all generations will count me blessed;
Because he who is mighty, he whose name is holy, has wrought for me his wonders.
He has mercy upon those who fear him, from generation to generation;
He has done valiantly with the strength of his arm, driving

the proud astray in the conceit of their hearts;
He has put down the mighty from their seat, and has exalted the lowly;
He has filled the hungry with good things, and sent the rich away empty-handed.
He has protected his servant Israel, keeping his merciful design in remembrance, according to the promise which he made to our forefather, Abraham and his posterity for evermore. 

Amen