Know that since the kindness of man, the ruler of his body, had a face to the pure light, which is its father, and a face to nature, which is the pure darkness, which is its mother, the rational soul was a mediator between the light and the darkness, and the reason for its mediation in position is because it is a ruler, like the universal soul, which is between the mind and the body, and it is the essence. It is dark and the mind is pure light, so this rational soul was like the isthmus between light and darkness, giving each person his right. Whenever one of the two sides prevailed over it, it was as it was defeated by it, and if it had no inclination toward one of the sides, it received matters in moderation, was fair, and judged with truth. Let us mention in this connection the consideration of what was mentioned in the signs. Physiognomy of the body