... (miles). Thenceforward the initiate belonged to the sacred militia of the invincible god and fought the powers of evil under his orders. All these ideas and institutions are so much in accord with what we know of Mazdean dualism, in which the entire life was conceived as a struggle against the malevolent spirits; they are so inseparable from the history even of Mithraism, which always was a soldiers' religion, that we cannot doubt they belonged to it before ... — The Oriental Religions in Roman Paganism • Franz Cumont