Often, actually, very often, God allows his greatest servants, those who are far advanced in grace, to make the most humiliating mistakes. This humbles them in their own eyes and in the eyes of their fellow men.
"God is the brightest of lights which can never be extinguished, and the choirs of angels radiate light from the divinity. Angels are pure praise without any trace of a bodily deed."-St. Hildegard of Bingen