The origin of the devotion to the Venerable Servant of God Cardinal Francois-Xavier Nguyên Van Thuân, so widespread in the world, has its roots in the phenomenon of migration, due to the difficult situation that arose during the war in Vietnam. For many Vietnamese and non-Vietnamese people this devotion represents a unifying factor, an expression of faith and of devotion to the religious tradition aiming at strengthening the bond with their country of origin..