We have and Ethos Light self that's down below us, upside down, and we have an Eiros self above us, our Sound self. These are our Light and Sound bodies.

Ethos is the Light body, and the Eiros is the Sound body. When they come together and they phase together properly like they are supposed to, they continually recreate the matter body as the eternal life system.

The Ethos is the light imprint. The Eiros is the Sound part, which is the sound body. When they come together, when phasing happens, where that one comes down, and the other comes up, they create the matter body (Incarnate Identity) in the center.

(Engaging the God Languages - Module Handbook - Page 6)