Of the many promises Our Lord Jesus Christ did reveal to Saint Margaret Mary in favor of souls devoted to His Sacred Heart the principal ones are as follows:

1. I will give them all the graces necessary for their state of life.
2. I will give peace in their families.
3. I will console them in all their troubles.
4. I will be their refuge in life and especially in death.
5. I will abundantly bless all their undertakings.
6. Sinners shall find in my Heart the source and infinite ocean of mercy.
7. Tepid souls shall become fervent.
8. Fervent souls shall rise speedily to great perfection.
9. I will bless those places wherein the image of My Sacred Heart shall be exposed and venerated.
10. I will give to priests the power to touch the most hardened hearts.
11. Persons who propagate this devotion shall have their names eternally written in my Heart.
12. In the excess of the mercy of my Heart, I promise you that my all powerful love will grant to all those who will receive Communion on the First Fridays, for nine consecutive months, the grace of final repentance: they will not die in my displeasure, nor without receiving the sacraments; and my Heart will be their secure refuge in that last hour. 

 
Novena Prayer

Divine Jesus, You have said, “Ask and you shall receive; seek and you shall find; knock and it shall be opened to you.” Behold me kneeling at Your feet, filled with a lively faith and confidence in the promises dictated by Your Sacred Heart to Saint Margaret Mary. I come to ask this favor: Mention your request).
 
To whom can I turn if not to You, Whose Heart is the source of all graces and merits? Where should I seek if not in the treasure which contains all the riches of Your kindness and mercy? Where should I knock if not at the door through which God gives Himself to us and through which we go to God? I have recourse to You, Heart of Jesus. In You I find consolation when afflicted, protection when persecuted, strength when burdened with trials, and light in doubt and darkness.
 
Dear Jesus, I firmly believe that You can grant me the grace I implore, even though it should require a miracle. You have only to will it and my prayer will be granted. I admit that I am most unworthy of Your favors, but this is not a reason for me to be discouraged. You are the God of mercy, and You will not refuse a contrite heart. Cast upon me a look of mercy, I beg of You, and Your kind Heart will find in my miseries and weakness a reason for granting my prayer.
 
Sacred Heart, whatever may be Your decision with regard to my request, I will never stop adoring, loving, praising, and serving You. My Jesus, be pleased to accept this my act of perfect resignation to the decrees of Your adorable Heart, which I sincerely desire may be fulfilled in and by me and all Your creatures forever.
 
Grant me the grace for which I humbly implore You through the Immaculate Heart of Your most sorrowful Mother. You entrusted me to her as her child, and her prayers are all-powerful with You. Amen.
 
 
Act of Consecration to the Sacred Heart
 
O Sacred Heart of Jesus, to Thee I consecrate and offer up my person and my life, my actions, trials, and sufferings, that my entire being may henceforth only be employed in loving, honoring and glorifying Thee. This is my irrevocable will, to belong entirely to Thee, and to do all for Thy love, renouncing with my whole heart all that can displease Thee.   I take Thee, O Sacred Heart, for the sole object of my love, the protection of my life, the pledge of my salvation, the remedy of my frailty and inconstancy, the reparation for all the defects of my life, and my secure refuge at the hour of my death. Be Thou, O Most Merciful Heart, my justification before God Thy Father, and screen me from His anger which I have so justly merited. I fear all from my own weakness and malice, but placing my entire confidence in Thee, O Heart of Love, I hope all from Thine infinite Goodness. Annihilate in me all that can displease or resist Thee. Imprint Thy pure love so deeply in my heart that I may never forget Thee or be separated from Thee.  II beseech Thee, through Thine infinite Goodness, grant that my name be engraved upon Thy Heart, for in this I place all my happiness and all my glory, to live and to die as one of Thy devoted servants.    Amen.
 
– St. Margaret Mary Alacoque
 
from the book Devotion To The Sacred Heart by Fr. John Croiset, S.J.
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