Purāṇa-saṃhitā 4.20: "anādy-antam ajaṃ sūkṣmaṃ tri-guṇaṃ prabhavāpyayam | asāmpratam avijñeyaṃ brahmāgre samavarttata" — "In the beginning there was brahman, without beginning or end, unborn, subtle, having the three qualities (guṇa), the origin and cessation [of the cosmos], timeless, and unknowable."
"Thus we have to study well the "Primary creation," before we can understand the Secondary. The first Race had three rudimentary elements in it; and no fire as yet; because, with the Ancients, the evolution of man, and the growth and development of his spiritual and physical senses, were subordinate to the evolution of the elements on the Cosmic plane of this Earth. All proceeds from Prabhavapyaya, the evolution of the creative and sentient principles in the gods, and even of the so-called creative deity himself. This is found in the names and appellations given to Vishnu in exoteric scriptures. As the Protologos (the Orphic), he is called Purvaja, "pregenetic," and then the other names connect him in their descending order more and more with matter." - H.P. Blavatsky, The Secret Doctrine
"Let this word be understood as a place or plane where all things originate and dissolve. Nevertheless, it is necessary to emphasize the transcendental idea that Prabhavapyaya is neither the “Mother of the World,” nor the womb of the Cosmos, nor the material cause of our planet Earth." - Samael Aun Weor, Cosmic Teachings of a Lama