In the article “The Matter of Spiritual Attainment,” (Shamati #3) Baal HaSulam says that Ein Sof is the source of everything and that it is called “Light without a vessel,” which mean the limitless light of the Creator in a certain attribute. From there the root of creation originates, the connection between the created being and the Creator, called the Creator’s desire to do good to His created beings. This pleasure begins in the world of Ein Sof and descends through all the worlds until the world of Assiya.
The upper light that wants to fill all the souls that descend from the world of Ein Sof through the worlds of Adam Kadmon, Atzilut, Beria, Yetzira, Assiya, and our world. In order to do so He needs to create a vessel for the light that the souls can be filled with because the light brings the pleasure the Creator wants to give them.
It is like a child who wants to enjoy only sweets, but his parents do not let him. This is how the Creator treats us. In order to determine the pleasure that He gives us, the Creator puts us through many different impressions.
We need to choose which fillings are correct in order to get closer to the Creator, to resemble Him, and to begin to see the world as He sees it: infinite and whole. In order to do so, we need to change our desires and our awareness.
From KabTV’s “Fundamentals of Kabbalah,” 12/8/19