Part 4: This is the Inner and Encompassing Light... These are the names of two levels of the Light …of the Sefirot, which is the underlying foundation of the Vessel. Here we have the explanation of the Inner and Encompassing Light. Thus the Zohar (Raya Meheimna, Emor 109b) states that “He is inside every Sefirah and outside every Sefirah”.
As discussed earlier, the action of the Line in governing the Residue through all the pathways discussed is itself in the mode of limitlessness – which is the mode of perfection. Thus every single level within the Residue is under the supervision of Eyn Sof in His intrinsic perfection, and these different parts exist only because it was His Will that they should exist. This is expressed by saying that Eyn Sof is found in every single Sefirah on every side, and the entire existence and functioning of the Sefirah is only through Him.