…all make up one entity of Ten Sefirot. The proof of this is that as soon as we examine these encompassing levels, we see that they too are drawn to Zeir Anpin from Abba and Imma in order to adorn him with their crowns. We can thus immediately infer that the entire array of Mental Powers make up a single overall entity of which the internal and encompassing lights are two parts.
This entity is unsuited to enter into Zeir Anpin because of the disparity in their respective levels… Only Netzach-Hod-Yesod of this entity are on the same level as Zeir Anpin, enabling him to receive them as his interior Neshamah. But the power of its Chochmah-Binah-Daat and Chessed-Gevurah-Tiferet is in excess of what is needed for the Neshamah in Zeir Anpin’s vessel – because everything follows the principle of gradation.