3. The Physical, represented by the Chhâyâs of the Lunar Pitris, round which Nature has concreted the present physical body. This body serves as the vehicle for the “growth,” to use a misleading word, and the transformations—through Manas, and owing to the accumulation of experiences—of the Finite into the Infinite, of the Transient into the Eternal and Absolute.

Each of these three systems has its own laws, and is ruled and guided by different sets of the highest Dhyânis or Logoi. Each is represented in the constitution of Man, the Microcosm of the great Macrocosm; and it is the union of these three streams in him, which makes him the complex being he now is.

The Secret Doctrine, Vol. 1 of 4 — Part 162

Nature, the physical evolutionary Power, could never evolve Intelligence unaided; she can only create “senseless forms,” as will be seen in our Anthropogenesis. The Lunar Monads cannot progress, for they have not yet had sufficient touch with the forms created by “Nature,” to allow of their accumulating experiences through its means. It is the Mânasa‐Dhyânis who fill up the gap, and they represent the evolutionary power of Intelligence and Mind, the link between Spirit and Matter—in this Round.

The Secret Doctrine, Vol. 1 of 4 — Part 162

Also it must be borne in mind that the Monads which enter upon the evolutionary cycle upon Globe A, in the first Round, are in very different stages of development. Hence the matter becomes somewhat complicated. Let us recapitulate.

The Secret Doctrine, Vol. 1 of 4 — Part 162

The most developed, the Lunar Monads, reach the human germ‐stage in the First Round; become terrestrial, though very ethereal, human beings towards the end of the Third Round, remaining on the Globe through the “obscuration” period, as the seed for future mankind in the Fourth Round, and thus become the pioneers of Humanity at the beginning of this, the present Fourth Round. Others reach the human stage only during later Rounds, _i.e._, in the second, third or first half of the Fourth Round. And finally the most retarded of all—_i.e._, those still occupying animal forms after the middle turning‐point of the Fourth Round—will not become men at all during this Manvantara. They will reach to the verge of Humanity only at the close of the Seventh Round, to be, in their turn, ushered into a new Chain, after Pralaya, by older pioneers, the progenitors of Humanity, or the Seed‐Humanity (Shishta), viz., the men who will be at the head of all at the end of these Rounds.