The Phoenicians who from their sagacity and learning possess great insight into things divine, hold the doctrine that this universally diffused radiance is a part of the "Soul of the Stars." This opinion is consistent with sound reason: if we consider the light that is without body, we shall perceive that of such light the source cannot be a body, but rather the simple action of a mind, which spreads itself by means of illumination as far as its proper seat; to which the middle region of the heavens is contiguous, from which place it shines forth with all its vigour and fills the heavenly orbs, illuminating at the same time the whole universe with its divine and pure radiance.

Upon the Sovereign Sun (362)