Baal HaSulam, “Introduction to From the Mouth of a Sage”: It is known from books and from authors that the study of the wisdom of Kabbalah is an absolute must for any person from Israel. If one studies the entire Torah and knows the Mishnah and the Gemara by heart, if one is also filled with virtues and good deeds more than all his contemporaries, but has not learned the wisdom of Kabbalah, he must incarnate once more into this world to study the secrets of Torah and wisdom of truth. …
This is the reason why we reincarnate, generation-by-generation through our current generation, which is the residue of the souls upon which the intention of Creation has not been completed, as they did not attain the secrets of the Torah in the past generations.
Baal HaSulam writes that we have to reveal the wisdom of Kabbalah so that all souls (and each of us is the carrier of a piece of the common soul) could connect together into one common soul called “Adam” and achieve the state of complete similarity to the Creator, that is, to rise to the level of absolute knowledge, immortality, and perfection.
Question: Can we imagine from the Kabbalistic point of view that creation is a huge will to receive, which, as it is constantly developing, undergoes all kinds of metamorphoses along the historical axis, and each person is an individual will to receive?
Answer: Yes. These desires, interacting with each other as in a kaleidoscope, constantly clarify various sides of the Creator and gradually connect with each other.
Question: Does it mean that these are the same souls?
Answer: Yes. The same souls descend to the world, only on different levels and in different combinations with each other.
From KabTV’s “Fundamentals of Kabbalah,” 1/8/19