Part 4: The action of the Unlimited within the Residue is called one Line… In other words, the entry of Eyn Sof into the government of the Residue is called a Line from Him that enters inside the cavity. In speaking of a Line, we mean that a single Line was drawn down from the encompassing Eyn Sof, blessed be He, like a channel or pipe, into the cavity. Through this Channel, light descended from Eyn Sof to what is inside the cavity, and by this means the Emanator is attached to that which emanated.