“(24. The higher creators reject in their pride the forms evolved by the “Sons of Yoga”. 25. They will not incarnate in the early “Egg-Born”. 26. They select the later androgynes. 27. The first man endowed with mind.)
24. THE SONS OF WISDOM, THE SONS OF NIGHT (ISSUED FROM THE BODY OF BRAHMA WHEN IT BECAME NIGHT), READY FOR REBIRTH, CAME DOWN. THEY SAW THE (INTELLECTUALLY) VILE FORMS OF THE FIRST THIRD (STILL SENSELESS RACE). “WE CAN CHOOSE”, SAID THE LORDS, “WE HAVE WISDOM”. SOME ENTERED THE CHHAYAS. SOME PROJECTED A SPARK. SOME DEFERRED TILL THE FOURTH (RACE). FROM THEIR OWN ESSENCE THEY FILLED (INTENSIFIED) THE KAMA (THE VEHICLE OF DESIRE). THOSE WHO RECEIVED BUT A SPARK REMAINED DESTITUTE OF (HIGHER) KNOWLEDGE; THE SPARK BURNT LOW. THE THIRD REMAINED MINDLESS. THEIR JIVAS (MONADS) WERE NOT READY. THESE WERE SET APART AMONG THE SEVEN (PRIMITIVE HUMAN SPECIES). THEY (BECAME THE) NARROW-HEADED. THE THIRD WERE READY. “IN THESE SHALL WE DWELL”, SAID THE LORDS OF THE FLAME AND OF THE DARK WISDOM.
Up to the Fourth Round, and even to the later part of the Third Race in this Round, Man – if the ever-changing forms that clothed the Monads during the first three Rounds and the first two and a half races of the present one can be given that misleading name – is, so far, only an animal intellectually.
It is only in the actual midway Round that he develops in himself entirely the fourth principle as a fit vehicle for the fifth.
“They were not ready” signifies that the Karmic development of these Monads had not yet fitted them to occupy the forms of men destined for incarnation in higher intellectual Races.
The Sons of Wisdom, or the spiritual Dhyanis, had become “intellectual” through their contact with matter, because they had already reached, during previous cycles of incarnation, that degree of intellect which enabled them to become independent and self-conscious entities, on this plane of matter.
They were reborn only by reason of Karmic effects. They entered those who were “ready”, and became Arhats, or sages.
It does not mean that Monads entered forms in which other Monads already were. They were the “Essences”, “Intelligences”, and conscious spirits; entities seeking to become still more conscious by uniting with more developed matter.
Their essence was too pure to be distinct from the universal essence; but their “Egos”, or Manas (since they are called Manasaputra, born of “Mahat”, or Brahma) had to pass through earthly human experiences to become all-wise, and be able to start on the returning ascending cycle.
The Monads are not discrete principles, limited or conditioned, but rays from that one universal absolute Principle.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 