Nothing disappears in spirituality. On the contrary, the differences between the souls become even more vivid. Every particular soul possesses special qualities that create the entire wealth of perceiving the Creator. This happens precisely by virtue of connecting with the opposite qualities of other souls. That is how the mutual perception of the Creator becomes 620 times greater than the perception of a separate soul.
The size of our spiritual vessel (Kli) is not defined by its quality, but quantity. That is why every soul is revealed more powerfully and uniquely. This is similar to stem cells which are universal and can be used like building blocks to build everything else. The heart, liver, kidneys, and lungs can all be built out of this basis called the stem cell.
The same thing is true in spirituality. For now each of us lives inside the “stem cell” of his own soul. Later we will begin connecting to the general system, the group, or the system of souls that we reveal in the group, and by attaching them to us, we will then connect to the Creator who becomes revealed in the system of souls. That is when we will also begin to attain ourselves: Who we are, what we belong to, what our soul is, what my mission is, and what my main quality is out of the entire sum of qualities accompanying it.
Therefore, when we advance in spirituality, every person becomes more and more connected with everything, but at the same time he stands out more and more, becomes more unique because by connecting with others, he increases his own “stem cell.” That is why Baal HaSulam writes in the article “The Freedom” that every person must develop, rather than suppress, his unique qualities. By virtue of every person’s uniqueness, we will attain a huge, perfect vessel of the soul in which we will be able to perceive the entire spiritual world and the Creator 620 times greater than at the beginning of creation.
From the 2nd part of the Daily Kabbalah Lesson 9/1/10, The Zohar