1059. From this it becomes clear that the cortical substances relate to the heavenly qualities. How this is so, can be evident especially from the cortical substance of the brain, and in the body, from the cortical-like substance of the kidneys. These substances are therefore the beginnings, where the [animate] spirits are formed. Spiritual qualities go back to them as their origin, i.e., they are the beginnings of spiritual qualities, because the spiritual comes forth from them. They are also of a different color, like the color of the blood, a bright red.