Stanza VI, Sloka 5
5. At the fourth, the sons are told to create their images. One third refuses – to obey.
The curse is pronounced; they will be born on the fourth suffer and cause suffering; this is the first war.
“Mr. B. Keightley: Question 5. “Nature, the physical evolutionary power.” What does “Nature” represent?
Mme. Blavatsky: “Nature, the physical evolutionary power”, stands here for all the forces which are innate in the four lower Kosmic principles, or the Kosmic quaternary. For Kosmos has got its seven principles, as we have – e.g., my hand in conjunction with my brain makes signs on this paper which convey an intelligible meaning (I am not sure of it, though!)
But if my brain were partially paralyzed, as has been observed in certain cases of disease, my hand may still, by sheer force of habit, make signs on this paper, or pretend to write, but these signs would convey no meaning whatever.
In the latter case, only the lower quaternary or physical evolutionary power is acting. This, I suppose, answers sufficiently. That is what I mean by it.
Mr. B. Keightley: Question 6. What class or classes of intelligences are included here under the term “Nature”?
Mme. Blavatsky: The four lower classes or principles, as I have just said. There is no need to repeat it.
Mr. B. Keightley: Question 7. “The Chhayas of the Lunar Pitris.” What is a Chhaya?
Mme. Blavatsky: Did I not tell you 29,000 times, Chhaya is a Sanskrit word, meaning shadow, or image, or what we call astral body? [ ] {Sanjna}, the wife of Surya, the Sun, becoming tired of the too ardent love of her husband, left him her handmaiden, Chhaya, that is to say, her own astral image, or body, and took herself off to the jungles to become a yogi.
So runs the tradition. Somehow or other, as Vishnu Purana narrates, the Sun, deceived by the likeness, managed to have two children from this astral body – so it is stated in Vishnu Purana – and that is the origin of Chhaya, the astral body.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 