Answer: We can understand this by the following example: Suppose we attain a bit of ourselves while working in the group of ten, a section of our soul, and then we attach another ten to ourselves and begin to attain more; the transition from a small whole state to the next whole state is called reincarnation or the cycle of the soul.
This is how the soul seems to wrap itself with larger and larger clothing, with connections to other parts of the general soul until it attains the general common form that is eternal and perfect.
This is exactly where the cycles and the reincarnation of the soul are leading us. It has nothing to do with periods of corporeal life or the physical death of the body, or any of its conditions and development.
From the Kabbalah Lesson in Russian 11/6/16