Tertullian

“ So far as a human being can form a definition of God, I adduce one which the conscience of all men will also acknowledge,—that God is the great Supreme existing in eternity, unbegotten, unmade without beginning, without end. ”

“ Now, since all are agreed on this point (because nobody will deny that God is in some sense [6] the great Supreme, except the man who shall be able to pronounce the opposite opinion, that God is but some inferior being, in order that he may deny God by robbing Him of an attribute of God) , what must be the condition of the great Supreme Himself? ”

“ Surely it must be that nothing is equal to Him, i.e. that there is no other great supreme; because, if there were, He would have an equal; and if He had an equal, He would be no longer the great Supreme, now that the condition and (so to say) our law, which permits nothing to be equal to the great Supreme, is subverted. That Being, then, which is the great Supreme, must needs be unique, [7] by having no equal, and so not ceasing to be the great Supreme. Therefore He will not otherwise exist than by the condition whereby He has His being ”