The soul is one for all or each one has his own, just as our world is one for all and each one has his own. But what we perceive in our egoism is called “our world,” “this world,” and what we perceive in the property of bestowal, and maybe even love, exiting our egoism, is called “spiritual world” or “soul.”
Question: Is the soul and the upper world the same?
Answer: The feeling of the upper world is called the “soul” or the “ten Sefirot.” The ten Sefirot are the skeleton of the soul.
The word “Sefira” comes from the word “luminous” (Sapir). It is a point that was egoistic and became bestowing, altruistic. Therefore, it glows.
From the Kabbalah Lesson in Russian 6/10/18