Tertullian

“ Thus far our discussion seems to imply that Marcion makes his two gods equal. For while we have been maintaining that God ought to be believed as the one only great Supreme Being, excluding from Him every possibility [1] of equality, we have treated of these topics on the assumption of two equal Gods; but nevertheless, by teaching that no equals can exist according to the law [2] of the Supreme Being, we have sufficiently affirmed the impossibility that two equals should exist. ”

“ Now, challenging, and in a certain sense arresting [7] the meaning of our adversary, who does not deny that the Creator is God, I most fairly object [8] against him that he has no room for any diversity in his gods, because, having once confessed that they are on a par, [9] he cannot now pronounce them different; not indeed that human beings may not be very different under the same designation, but because the Divine Being can be neither said nor believed to be God, except as the great Supreme. ”

“ Besides, it is not the characteristic of God to cease from any attribute [10] of His divinity—say, from His supremacy. For at this rate the supremacy would be endangered even in Marcion’s more powerful god, if it were capable of depreciation in the Creator. ”