The mode of demonstration, therefore, pertaining to _the one_ is, as we have said, twofold. For again, Plato delivers to us twofold names of the ineffable cause. In the Republic indeed he calls it _the good_, and demonstrates it to be the fountain of the truth which unites intellect and intelligibles. But in the Parmenides, he denominates such a principle as this _the one_, and shows that it gives subsistence to the divine unities. Again therefore, of these names, the one is the image of the progression of the whole of things, but the other of their conversion. For because indeed all things derive their subsistence and proceed from the first principle, on this account referring _the one_ to it, we demonstrate that it is the cause of all multitude and every progression. For whence is multitude unfolded into light except from _the one_? But because again the progressions from it are naturally converted to it, and desire its ineffable and incomprehensible hyparxis, we denominate it _the good_. For what else is that which converts all things, and which is extended to all beings as the object of desire, but _the good_? For all other things subsist distributedly, and are to some beings honourable, but to others not. And every thing which in any respect whatever is said to have a subsistence aspires after some things, and avoids others. But _the good_ is the common object of desire to all beings, and all things according to their nature verge and are extended to this. The tendency however of desiring natures is every where to the appropriate object of desire. _The good_ therefore converts, but _the one_ gives subsistence to all secondary natures. Let not, however, any one suppose that the ineffable can on this account be named, or that the cause of all union is doubled. For here indeed we transfer to it names, looking to that which is posterior to it, and to the progressions from, or the circular conversions to it. Because, indeed, multitude subsists from it, we ascribe to it the appellation of _the one_; but because all things even as far as to things that have the most obscure existence, are converted to it, we denominate it _the good_.