Part 2: According to the strength of the Mental Powers… Zeir Anpin’s Mental Powers vary in strength in the phases of immaturity and maturity and so too in the ascents that follow maturity. This is because the degree to which Abba and Imma are grafted into and rule Zeir Anpin may be lesser or greater.
…so is the strength of the entire body. All of Zeir Anpin’s power derives from Abba and Imma, and therefore the strength of Zeir Anpin depends on the strength with which Abba and Imma function within him.