God is the necessary Being
A quiddity is what defines a thing as being what it is rather than something else. To possess a quiddity is therefore to possess a boundary, a determination that separates a thing from what it is not.
The question then arises: can the Necessary Being possess such a limit? If the Necessary Being were limited, that limit would have to be imposed by something other than itself. It cannot be imposed by another, for then the Necessary Being would depend on something external and would no longer be truly necessary.
Therefore, the Necessary Being cannot possess a quiddity in the ordinary sense. It cannot be defined through exclusion or differentiation. The Necessary Being is the negation of absolute non-being and cannot stand opposed to any reality outside itself, since nothing exists independently of it. Consequently, the Necessary Being must contain all reality within itself, not as a collection of separate beings, but as the absolute and undivided source from which all determinations and manifestations proceed. This is why Wahdat al-Wujūd affirms the unity of Being: multiplicity belongs only to the level of manifestation, while the Absolute remains beyond all limitation and differentiation.
The manifestation of something, is the qualia of something. So the knowledge is a manifestation. So the necessary being need to be an intellect that intellects everythint.