A Chapter from it, in Answer to a Questioner:

If Allah were intermingled (mumazijan) with things, He would be similar to them.

And if He were neither distinct (mubayinan) nor intermingled, He would be non-existence.

But I say: He is distinct from them in His Essence (Jawhar), yet not distinct from them as an opposite.

And I say: He is outside of them, yet I do not mean that He is not within them; rather, I mean that His Essence is separate from their essence, even if He is [manifest] from them. And I do not say their essence is mixed with His Essence, because they are originated (muhdatha) while He is Eternal (Qadim), and they are created while He is the Creator.

Interpretation of that:

His saying: [If Allah were intermingled with things, He would be similar to them] implies negating His resemblance to things.

And his saying: [And if He were distinct from them, He would be an opposite to them]; he intended by this to establish the two manifestations: The manifestation without homogeneity with them in their origination (hadath); for if He were distinct from them in manifestation, He would be their opposite, and it is not permissible for a thing [here: The Divine] to have an opposite.