substance of some plane of existence, and a form is gradually built. The form whether spiritual, astral or physical, becomes organized in a particular way through its contacts with environment. Its experiences are registered as feeling and intelligence. Feeling and intelligence, however, are not registered by physical substance. Three dimensional existence affords a means of contacting experiences of great contrast and wide diversity, but in itself is too coarse to retain such impressions. But associated with all physical substance (see Course I) is both the ether - a transition substance - and the four-dimensional astral, or stellar, substance. This four-dimensional substance is frictionless, and retains indefinitely the motions imparted to it. And it is in this fourth-dimensional substance that all physical and astral experiences are recorded.
The recording of an experience, whether directly derived from he external environment or from a mental process, causes a change to take place in the substance where the recording is made. That is, the sum total of the organization in the finer forms, all derived from experiences, constitutes the soul, the mind, the character, or the unconscious mind, these four terms signifying identically the same thing.
What these experiences have been was determined by the Birth-chart of the ego. Each of its two souls or thought-organization, is moving forward under the impetus given it by the ego, gathering those experiences, in association with various forms, which it requires to develop the abilities indicated by the ego's birthchart to be necessary to perform the required function in realizing the Cosmic Plan. It is busy acquiring both the experience and the power to be able to handle that section of Cosmic Work for which the ego provided the blue-print.
The ego's chart is the blue-print to which both the female soul and the male soul work. That is, in the division of the soul sphere in the higher state of the spiritual realm, as a physical cell so often divides to form two, the original polarity of the ego impressed itself equally upon each. But this quality of attracting certain events and repelling others, because exerted in the one case from feminine relations and in the other from those masculine, does not result in identical experiences for twin souls. As the essential polarity of each is the same, in their boarder outline the trains of experience parallel each other. But in particulars there is wide variation. Yet both the parallels and the variations in training tend to educate them so that they both desire, and are fitted for, a given work, in which their abilities complement each other.
Because through the long stretch of time since its formation a soul continues to manifest attractive and repellent qualities similar to those of its ego's birth-chart, even though these qualities have been given special twists and trends through contact with environment, the birth-chart of an individual when he appears one earth in human form bears, in a broad and general way the impress which indicates his Cosmic Work. But from this we must not conclude that the birth-charts of twin soul must be almost identical. In their boarder aspect they show similarity; otherwise they would not be fitted to work together in the performance of a common Cosmic Function. But that their abilities should complement each other, each has had a variety of experiences not undergone by the other; and a birth-chart is a map of all the experiences a soul has had up to the time of human birth.