...in accordance with the mystery of Father and Mother, Son and Daughter... In other words, this developmental sequence is called a complete array (in which each Partzuf is in its proper place). For the result is the Son or the Daughter, depending on whether the influence is that of Kindness or Judgment, while the causes of the result are two: Father and Mother.
...where each shows kinship to the other in the manner that is befitting. The nature of this developmental chain governs the relationship that each one must have with the other. The kinship of each Partzuf with the others, as stated above, is according to its place in the developmental chain. (Thus since Zeir and Nukva develop from Abba and Imma, they are in the category of a son and daughter – and the governmental order follows this developmental sequence – while the relationship between Zeir and Nukva is like that between a brother and sister.)