I tried to study it more, but I cannot seemed to find nice Torah database that talked about it
But based on those quotes and Jewish philosophers, it seems Ayin is something that is made of everything, and then we can only stay silent about it because it cannot be described under the language of "everything", to put it roughly
It kinda reminds how when you mix all colors of light in the rainbow, you get white, and Ayin is this white thing, which if your language of colors is only restricted to not white, than you cannot describe it even in principle