This novena is very powerful for having a grace called "Novena of Grace"

O most amiable and most beloved Saint Francis Xavier, I reverently adore the divine Majesty. I am delighted with the very special gifts of grace that God has favored you during your earthly life and with those of glory with which he enriched you after death and I warmly thank him. I implore you with all the affection of my heart to ask for me, with your most effective intercession, first of all the grace of living and dying holy. I also beg you to obtain grace for me ... But if what I ask were not according to the greater glory of God and the greater good of my soul, I beg you to beg the Lord to grant me what is most useful to one and to else. Amen. Pater, Ave, Gloria.

To be recited for nine consecutive days