This is called Netzach-Hod-Yesod of the Mental Powers… This is because everything is measured in terms of the Ten Sefirot, and thus the Mental Powers of Chochmah-Binah-Daat as a whole are likewise measured in these terms. Accordingly the stages in which the Mental Powers develop follow the steps on the ladder of the Ten Sefirot: Netzach-Hod-Yesod, Chessed-Gevurah-Tiferet, Chochmah-Binah-Daat. Netzach-Hod-Yesod of the Mental Powers – their lowest possible degree of strength – is one single level of the Mental Powers as a whole.