Man’s Essence Is the Will to Receive
All the vessels and the bodies, both from spiritual worlds and from physical worlds, are deemed spiritual or corporeal substance, whose nature is the will to receive.
– Baal HaSulam, “The Freedom”
Creation refers to appearance [relative to itself] of something that did not exist before [this realization]. This is considered existence from absence [and upon realizing it, it is called “the creature”]. Yet, how do we picture something that is not included in Him, since He is almighty and includes all of them together? And also, one does not give what is not in Him.
As we have said, the whole Creation that He created is only the Kelim (plural for Kli) of the souls, which is the will to receive. This is quite clear, since He necessarily does not have a will to receive, as from whom would He receive? Hence, this is truly a new Creation, not a trace of which existed previously, and is hence considered existence from absence [and the Creator fills it].
– Baal HaSulam, “Introduction to the Preface to the Wisdom of Kabbalah,” Item 4