Thaïs and Athanaël travel on foot through the desert. Thaïs is exhausted, but Athanaël forces her to keep going and thus do penance for her sins. They reach a spring, where Athanaël begins to feel pity rather than disgust for her, and they share a few moments of idyllic, platonic companionship as they rest. Shortly afterwards, they reach the convent where Thaïs is to stay. Placing her in the care of Mother Superior Albine, Athanaël realizes that he has accomplished his mission — and that he will never see her again.