3 If each of them was produced, after the manner of men, actually and according to its own generation, then either those thus generated by the Father will be of the same substance with Him, and similar to their Author; or if they appear dissimilar, then it must of necessity be acknowledged that they are [formed] of some different substance. Now, if the beings generated by the Father be similar to their Author, then those who have been produced must remain for ever impassible, even as is He who produced them; but if, on the other hand, they are of a different substance, which is capable of passion, then whence came this dissimilar substance to find a place within the incorruptible Pleroma?
Further, too, according to this principle, each one of them must be understood as being completely separated from every other, even as men are not mixed with nor united the one to the other, but each having a distinct shape of his own, and a definite sphere of action, while each one of them, too, is formed of a particular size, — qualities characteristic of a body, and not of a spirit. Let them therefore no longer speak of the Pleroma as being spiritual, or of themselves as “spiritual,” if indeed their Æons sit feasting with the Father, just as if they were men, and He Himself is of such a configuration as those reveal Him to be who were produced by Him.
Source: Adversus haereses (New Advent)