Indeed, the entire functioning of the soul, whether through the body or within the soul itself or through the interconnection of different parts of the soul – i.e. the vital Nefesh with the intelligent soul, etc. – everything is all through the mystery of coupling (זיווג, zivug). In other words, in order to display the developmental sequence, a fit cause must exist in order to produce each effect, and this is the concept of a Partzuf. (The construction of a Partzuf is brought about through the coupling that takes place between two higher Partzufim.)