The Clowns of God

What would happen, if the members of the Roman Curia discovered that the Pope was about to state publicly that he had received a private revelation that the world was about to end? Pope Gregory XVII claims to have received a private revelation of the end of the world - an apocalypse coming not in some distant future but at any moment. Is he a madman, as his cardinals suspect, a mystic, or a fanatic grasping for an unholy power?