Now you can see how the Other Side emerged. Initially one light of holiness remained – the Residue, which is an extension of the primordial Root. However, this light contains a certain deficiency, and it is this deficiency that becomes the root of the Other Side. But this deficiency is not a branch parallel to that light of holiness – it is impossible to say that the deficiencies in the Sefirot are equivalent to the Sefirot themselves.
This is because the deficiencies were newly brought into being to serve as the root of the Other Side. They are thus considered a root and not an extension, whereas the Sefirot are an extension of the primordial Eyn Sof. The deficiency in the light of the Residue is one root, from which the Other Side later emerges, a branch parallel to a branch. The Sefirot themselves are a branch of the primordial Root, while the deficiencies in the Sefirot are a new root from which the Other Side develops as a branch.