On October 13th, 1884, 33 years before the Miracle of the Sun in Fatima, Pope Leo XIII had a terrifying vision of the future of the Church.
With a handful of cardinals and Vatican staff members in attendance, Pope Leo XIII had finished celebrating mass in the Vatican Chapel. He suddenly stopped at the foot of the altar, his face having turned ashen white, and remained there standing for about ten minutes in a trance-like state.
Later when asked what had happened, Pope Leo XIII said that as he was about to leave the altar he heard two voices. One voice was of kind and gentle nature, while the other voice was guttural and grating. He listened to the voices, which seemed to emanate from the tabernacle, and overheard the following conversation.
The guttural voice, the voice of Satan in his pride, boasted to our Lord: “I can destroy your Church.”
The gentle voice of our Lord: “You can? Then go ahead and do so.”
Satan: “To do so, I need more time and more power.”
Our Lord: “How much time? How much power?
Satan: “75 to 100 years, and a greater power over those who will give themselves over to my service.”
Our Lord: “You have the time, you will have the power. Do with them what you will.”
After having the vision, Pope Leo immediately went from the Vatican Chapel to his private office and wrote the Prayer to Saint Michael, giving with it the instructions that it be prayed after all Low Masses.
The shorter version of the prayer written to Saint Michael the Archangel, which was instructed to be prayed after all Low Masses, is below:
Saint Michael Archangel, defend us in battle, be our protection
against the wickedness and snares of the devil; may God rebuke
him, we humbly pray; and do thou, O Prince of the heavenly host,
by the power of God, cast into hell Satan and all the evil spirits
who prowl through the world seeking the ruin of souls. Amen.