The mental powers include a Nefesh, Ruach, Neshamah, Chayah and Yechidah in their own right. The Chayah and Yechidah here are not the same as the encompassing lights of which we spoke in connection with the “inner and encompassing lights” (see Opening 28), for otherwise, various passages in the writings of the ARI would be completely contradictory. However, I will not expand on this now, because it is something that is quite evident in the passages which refer to the mental powers and those which refer to Eyn Sof, blessed be He, and the encompassing level.
I have explained here the way to resolve the contradictions, and everything should therefore be clear. For the lights have their own individual way of spreading forth, and thus they reach the Partzufim in the same way as discussed there, be it in the “garb” of Wisdom or the “undershirt” of Understanding.