Answer: From the start, one single creature existed called a soul. So that the creature can feel independent and attain the greatest blossoming, meaning the level of the Creator, it must pass through shattering and correction.
Therefore, in our world each one receives a small part of his soul. In each one of us there is a small part of the general soul called Adam HaRishon (the First Man) or simply, Adam (a desire). The fulfillment of the soul is Light.
In fact, the creature doesn’t feel itself in the beginning of its creation because in it there was very little desire and a very small Light. To bring it to a state resembling the Creator, the soul was broken into 600,000 main parts, and as a result of continued division, it became a multitude of many more fragments.
In each fragment, meaning in a small individual soul, there is a desire and its fulfillment also. During the shattering, these fragments began to feel independent; partitions appeared between them, as there are between people, and they began to feel cut off, torn off, and detached from each other. This rejection is called egoism. And at present it is necessary to gather all the fragments and bring them to their original state, to connect them into one general desire and fill them with one general Light.
But where then will the egoism disappear, which separates us as such, that each one is imprisoned in his Klipa (shell)? Nowhere. It is up to us to connect with each other against the egoism, and then we receive a Light that is 613 times greater than it was before.
In this way, instead of feeling a tiny bit of life: cold here, hot there, a bit of light, a bit of shade, we begin to feel piercing states. We feel, “with whom we have business,” who is giving us power and life, how it is possible to relate to the Creator and enter into a connection with Him: “I am to the Highest, and He is to me.” In other words, we begin to attain the Creator and rise to His level.
From the Kabbalah Lesson in Russian 4/23/17