The soul takes birth each time, and each time a mind, life and body are formed out of the materials of universal nature according to the soulís past evolution and its need for the future.
The soul gathers the essential elements of its experiences in life and makes that its basis of growth in the evolution; when it returns to birth it takes up with its mental, vital, physical sheaths so much of its Karma as is useful to it in the new life for further experience.
As regards the stage at which the soul returning for rebirth enters the new body no rule can be laid down, for the circumstances vary with the individual. Some psychic beings get into relation with the birth-environment and the parents from the time of conception and determine the preparation of the personality and future in the embryo, others join only at the time of delivery, others even later on in the life and in these cases it is some emanation of the psychic being which upholds the life. It should be noted that the conditions of the future birth are determined fundamentally not during the stay in the psychic world but at the time of death ó the psychic being then chooses what it should work out in the next terrestrial appearance and the conditions arrange themselves accordingly.
My hidden presence led thee unknowing on
From thy beginning in earth's voiceless bosom
Through life and pain and time and will and death,
Through outer shocks and inner silences
Along the mystic roads of Space and Time.