The astral man, intangible and invisible as he might be to our mortal, earthly senses, is still constituted of matter, though sublimated.
- Siphra Dzeniouta (The Book of Concealed Mystery) – Kabbalah
- The Popol Vuh (The Mythic and Heroic Sagas of the Kichés of Central America) – Kiche Manuscript
- Phaedrus – Plato
- Timaeus – Plato
- Aitareya Brahmanam – Vedas
