Where to Watch Thais (1984)

Thais, an Egyptian courtesan, is converted to a life of a penitant by Paphnutius, a holy man. She is taken to a convent in the desert and lives her life in the care of the abbess there. But Paphnutius is changed by the vision of Thais and becomes obsessed with gaining her love and retrieving her from the spiritual world for himself.