Is spiritual development , soul growth or experienced experiences in this life time changes/affect the soul permanently ?
Let's say by the considering possibilty of need of another birth
Will experienced soul growth be there and journey will continue ? Or It will be erases and back to soul state of current birth from scratch?
Soul, no.
Spirit, yes.
The Soul is "mortal" like the physical body, it will dissolve within the Astral Sphere during the "after-life" after a certain amount of time, just like the Physical body dies in the material world eventually.
During this phase of residence within the Astral Sphere (after departing from the physical world), the clock is ticking for the Soul/Astral Body and it is only a matter of time before it dissolves back into the Astral Elements.
Once that happens, the Spirit is released from its bondage with the Soul, and relocates into the Mental Sphere within its relevant zone. Here the individual Spirit may facilitate another incarnation if it is still required or desirable, or it may reside in the Mental Sphere if certain conditions are met (completion of required spiritual development, for the most part).
But the point is that the Spirit is the common denominator between all incarnations, and it will carry over many aspects of spiritual development into subsequent incarnations through the center called the Mental Matrix.
When incarnate and also during the departed Astral-phase called the afterlife, the Mental Matrix serves as the binding component between the Spirit and the Soul, but when both physical and Astral death have been experienced and only the Spirit remains, the Mental Matrix serves the purpose of retaining the attributes and powers developed by the individual into subsequent incarnations.
Consciousness development, psychic abilities, developed power over whichever forces, spiritual maturity, mental faculties, spiritual qualities etc. are all significantly retained between incarnations.
The Soul, on the other hand, is fresh with every incarnation, and the exact astral development/character temperament you possess in one life may change in another.
There may be a significant degree of overlap due to the influence of the Spirit's fundamental character and past experience, but the Soul is especially malleable during mortal life, and it often shifts around many of the details and nuances of your character development in reaction to your immediate life experiences and upbringing.
The disposition and development of the Soul in a particular incarnation can significantly determine how well past developments and/or abilities show themselves.
Memories, which are fundamentally processed by the Spirit, may also be retained between incarnations - but they usually need to be proactively retrieved by the practitioner through esoteric methods, as the brain of the incarnate body doesn't host any memories but its own and the Spirit is limited by this condition under normal circumstances. Sometimes past memories can break through unintentionally through spiritual development and other odd occurrences, though.
