This appears again when the soul gathers herself together to devote herself to her thoughts; for then she separates from the body so far as she can, and retires within herself better to be able to apply herself to the consideration of intelligible things. Indeed, being incorporeal, she unites with the body as closely as the union of things which by combining together perish because of each other, (thus giving birth to a mixture); at the same time, she remains without alteration, as two things that are only placed by each others' side; and she preserves her unity. Thus, according to her own life, she modifies that to which she is united, but she is not modified thereby. Just as the sun, by its presence, makes the air luminous, without itself changing in any way, and thus, so to speak, mingles itself therewith, without mingling itself (in reality), so the soul, though united with the body, remains quite distinct therefrom. But there is this difference, that the sun, being a body, and consequently being circumscribed within a certain space, is not everywhere where is its light; just as the fire dwells in the wood, or in the wick of the lamp, as if enclosed within a locality; but the soul, being incorporeal, and not being subjected to any local limitation, exists as a whole everywhere where her light is; and there is no part of the body that is illuminated by the soul in which the soul is not entirely present. It is not the body that commands the soul; it is the soul, on the contrary, that commands the body. She is not in the body as if in a vase or a gourd; it is rather the body that is in the soul.[370]