4 These remarks are, in like manner, applicable against the followers of Marcion. For his two gods will also be contained and circumscribed by an immense interval which separates them from one another. But then there is a necessity to suppose a multitude of gods separated by an immense distance from each other on every side, beginning with one another, and ending in one another. Thus, by that very process of reasoning on which they depend for teaching that there is a certain Pleroma or God above the Creator of heaven and earth, any one who chooses to employ it may maintain that there is another Pleroma above the Pleroma, above that again another, and above Bythus another ocean of Deity, while in like manner the same successions hold with respect to the sides; and thus, their doctrine flowing out into immensity, there will always be a necessity to conceive of other Pleroma, and other Bythi, so as never at any time to stop, but always to continue seeking for others besides those already mentioned.
Moreover, it will be uncertain whether these which we conceive of are below, or are, in fact, themselves the things which are above; and, in like manner, [it will be doubtful] respecting those things which are said by them to be above, whether they are really above or below; and thus our opinions will have no fixed conclusion or certainty, but will of necessity wander forth after worlds without limits, and gods that cannot be numbered.
Source: Adversus haereses (New Advent)