This Miraculous Novena of Grace was revealed by St. Francis Xavier himself. The cofounder of the Jesuits, St. Francis Xavier is known as the Apostle of the East for his missionary activities in India and other Oriental countries.
In 1633, 81 years after his death, Saint Francis appeared to Fr. Marcello Mastrilli, a member of the Jesuit order who was near to death. Saint Francis revealed a promise to Father Marcello: "All those who implore my help daily for nine consecutive days, from the 4th to the 12th of March included, and worthily receive the Sacraments of Penance and the Holy Eucharist on one of the nine days, will experience my protection and may hope with entire assurance to obtain from God any grace they ask for the good of their souls and the glory of God."
Father Marcello was healed and went on to spread this devotion, which is also commonly prayed in preparation for the Feast of St. Francis Xavier (December 3). Like all novenas, it can be prayed at any time of the year.
Miraculous Novena of Grace to Saint Francis Xavier
O St. Francis Xavier, well beloved and full of charity, in union with thee, I reverently adore the Majesty of God; and since I rejoice with exceeding joy in the singular gifts of grace bestowed upon thee during thy life, and thy gifts of glory after death, I give Him hearty thanks therefore; I beseech thee with all my heart's devotion to be pleased to obtain for me, by thy effectual intercession, above all things, the grace of a holy life and a happy death. Moreover, I beg of thee to obtain for me [mention your request]. But if what I ask of thee so earnestly doth not tend to the glory of God and the greater good of my soul, do thou, I pray, obtain for me what is more profitable to both these ends. Amen.