Pseudo-Dionysius the Areopagite

“ Much more then, as respects Him, Who is beyond all, is it necessary to make clear the difference of forms and shapes by reverent and God-becoming, and mystic explanations. And if you wish to apply the threefold shapes of bodies to the impalpable and shapeless God, you must say, that the Progression of Almighty God, which spreads out to all things, is a Diyine extension; and length, the power extending itself over the whole ”

“ And there is the power of the Divine similitude, which turns all created things to the Cause. These things, then, must be said to be similar to Almighty God, both after a Divine likeness and similitude. For, neither must we say that Almighty God is similar to them, because neither is a man like his own image. For, with regard to those of the same rank, it is possible that these should be similar to each other, and that the similarity corresponds to each, and that both are similar to each other, after a preceding appearance of like. ”

“ For the Word of God Itself extols the fact that He is dissimilar, and of the same rank with none; as "different "even from everything, and, what is more paradoxical, says there is nothing that is similar to Him. ”