Baal HaSulam, The Study of the Ten Sefirot, Part 1, “Table of Questions and Answers for the Meaning of the Words”: Question 27. Maatzil (the Creator). Any cause is regarded as the Maatzil of the effected degree. The title Maatzil contains both the Hamshacha (drawing) of the Ohr (Light) and the Kli (vessel) that receives the Ohr.
It’s clear for us that the upper degree is called the Creator with respect to the lower one that it has created. But why is it added here that the concept of “the Creator” includes not only the received Light, but also the vessel receiving this Light, meaning my vessel, desire?
I receive the Light and sense my reality inside my desire. Inside this reality, I feel the upper degree. In other words, the sensation in me is divided in two parts: myself and the upper one. And all this is called the Creator.
That is, everything is attained only inside man’s sensations, and I call a special part inside myself the Creator. Therefore, it is said: “From Your actions we will know You!”
We can talk about the Creator (Bo-reh or “come and see” in Hebrew) only to the measure of our own corrections. I call the Creator that part within myself that I correct to bestowal, to the properties that are not inherent in my nature from birth.
That is why the soul can be merely a point, a drop, or can grow bigger and bigger, but it is always part of the upper one. I sense the upper root, the Creator, inside the part in me that is corrected to bestowal and called the soul. The Creator is already in me, not in the heavens, but we are talking about the property of bestowal that is above me, above my nature. Although I have obtained it and am now working with it, I nonetheless attribute it to the upper one.
That is why the Creator is always within a human being, and not somewhere in the sky. The same applies to the upper degree: Only those who attain it and are in contact with it can talk about it. That is, the upper degree is also in me, only I consider it higher degree for me.
In my perception, there are always such degrees which I have already acquired and practically work with, as if they belong to me, and the one that is still higher and shines for me “from afar.” That is, it is in me, but in such a form that I cannot use it for the time being. Everything is perceived and sensed only within a person who attains.
From the 3rd part of the Daily Kabbalah Lesson 6/23/11, Talmud Eser Sefirot