If however it be requisite to discover the triadic nature of it from what has been laid down, we must employ the mode of analogy. Since therefore Plato himself calls the back of the heaven one thing, and its profundity another, it is evident that the celestial arch is the third thing; for the arch which is under this, he directly calls subcelestial. But as we say that the supercelestial place is established above the back of the heaven, so likewise we must grant that the subcelestial is different from the celestial arch. For the heaven is bounded, supernally indeed by the back, but beneath by the arch. And it is comprehended indeed by the supercelestial place, but it comprehends the subcelestial arch. It is evident therefore from these things, that the heaven presents itself to our view as triadic, according to its back indeed, connectedly containing all things in one simplicity; but according to its arch bounding the whole triad; and according to its profundity, itself proceeding into itself, and constituting the middle breadth of connexion and coherence. The back however, of the whole celestial order, is an intelligible deity, being perhaps allotted from hence this appellation. But it is intelligible as in the connective triad, externally compressing, and connectedly comprehending all the kingdom of the heaven. It likewise imparts to all the Gods by illumination a uniform and simple comprehension of secondary natures, and is supernally filled with intelligible union. Hence also, divine souls being led through all the celestial profundity, stand indeed on the back of the heaven, but the circulation carries them round as they stand; and thus they survey what is called the supercelestial place. The station therefore, is the establishment of souls in the intelligible watch tower of the heaven, extending to souls sameness, undefiled power, and undeviating intellection. But the circumduction is the participation of a life full of vigour, and the most acute energy. And the common presence of both these, comprehends the prolific energy, the quiet motion, and the stable intellection of intelligibles. But the celestial profundity, is the one continuity of the whole triad, and the middle deity which conjoins the whole[227] celestial order, proceeding indeed from the intelligible comprehension, but ending in the celestial arch, which defines the boundary of the whole of the heaven. There is therefore, one union and connexion of all this triad, and an indissoluble progression from the back as far as to the arch, through this middle deity which is connascent with both the extremes, and which unfolds indeed the connective multitude, but on each side is bounded by the extremes; one of which comprehends it supernally, but the other from beneath bounds its progression.