The author tries to make a sort of study on "mystical love in Louis Aragon's Fou d'Elsa". He first attempts to present the socio-historical and also personal elements of the genesis of Le Fou d'Elsa. It then traces the encounter between two experiences, one Eastern, the other Western. The essential idea is to conduct a parallel and genetic study of the main characters. Finally, the comparative look proposes to detach first the love of the Fool, of this complex space that is the mystical love and to demonstrate thereafter, the bilateral and present relation between the Creator and the creatures while revealing "the best of the narratives", that is to say the narrative of the love that Aragon, in his turn, takes back and reconstructs.