Da'as Tevunos - Section 120

Said the intellect - this is the generalization - when the master may He be blessed willed to innovate the general existence of nature in Good and negative, that its personalities be a mixture of both, he caused to flow from him may He be blessed a heavenly flow which causes the existence of the good which is in His nature and is etched in this good nature. And he returned and caused an absence of completion in this heavenly flow with his turning away of his countenance of goodness in complete concealment and etched in nature all of the deficiencies. Afterwards he returned and caused a flow through the illumination of his countenance to cause the existence of extant beings - beings in nature that are combinations of good and negative in one combination:

And now I will explain to you the existence of man according to this matter of the presence of negativity that we have mentioned