However, when new Mental Powers are required in Zeir Anpin, Israel Sabba and Tevunah must also be included in the process of coupling that produces them since they have to take the new aspect produced through the coupling and bring it down into Zeir Anpin. (In this case Israel Sabba and Tevunah do not simply transfer influence from Abba and Imma but extend and join with them as they couple, thereby forming one Partzuf.)
But when Israel Sabba and Tevunah function in Zeir Anpin through being clothed therein, there is certainly no need for them to couple – involving new arousal and excitement – because they then serve only to channel influence from Abba and Imma. The latter, however, are the very root of Kindness-Judgment-Mercy, and accordingly their interactive coupling must be in a constant state of repair.