[55] For since the soul is spoken of in two ways, first of all as a whole, secondly, as to the dominant part of it, which, to speak properly, is the soul of the soul, just as the eye is both the whole orb, and also the most important part of that orb, that namely by which we see; it seemed good to the law-giver that the essence of the soul should likewise be two-fold; blood being the essence of the entire soul, and the divine Spirit being the essence of the dominant part of it; accordingly he says, in express words, "The soul of all flesh is the blood thereof." [43]