That which is meant by the allegorical sentence, “Fiat Lux,” is, when esoterically rendered, “Let there be the ‘Sons of Light’,” or the Noumena of all phenomena. Thus the Roman Catholics rightly interpret the passage as referring to Angels, but wrongly as meaning Powers created by an anthropomorphic God, whom they personify in the ever thundering and punishing Jehovah.
These beings are the “Sons of Light,” because they emanate from, and are self-generated in, that infinite Ocean of Light, whose one pole is pure Spirit lost in the absoluteness of Non-Being, and the other pole, the Matter in which it condenses, “crystallizing” into a more and more gross type as it descends into manifestation. Therefore Matter, though it is, in one sense, but the illusive dregs of that Light whose Rays are the Creative Forces, yet has in it the full presence of the Soul thereof, of that Principle, which none—not even the “Sons of Light,” evolved from its Absolute Darkness—will ever know.
H.P. Blavatsky, The Secret Doctrine