The celestial arch therefore remains, which is the boundary beneath of the triad, and this is also the case with the intellect which is in it, being filled indeed by life, but united by the intelligible, and converting all the triad to its principle. For the arch also is similar to the back of the heaven, though according to interval it is less. Through subjection therefore it is diminished; but through similitude it is converted to the celestial summit. And this is the celestial intellect which is the proximate _sunocheus_[228] of the subcelestial arch. Hence each[229] arch is called the intellectual boundary of the intelligible and intellectual Gods. The whole connective triad therefore, is allotted such a division as this; the back (το νωτον) according to the intelligible (κατα το νοητον); the profundity according to life; and the arch according to intellect. But the whole of it is one and continued, because that which connects all other things, ought much more to be connective of itself. For each peculiarity of the Gods begins its energy from itself; the peculiarity indeed, which is collective, fixing itself collectively in the highest union; that which is convertive of wholes, converting itself to the principle; and that which is undefiled preserving itself prior to other things pure from matter. Hence the connective peculiarity also, prior to its participants, connects itself intelligibly and intellectually, and through this connexion the nature of the heaven is asserted to be one and continued. For all the triad converges to itself, and preserves its proper wholeness united, and most similar to itself according to nature. And the arch indeed, proximately connects all intellectuals, and compresses them on all sides. But prior to this, the celestial profundity itself, which also comprehends the arch, binds together the whole orders. And prior to these, the celestial back uniformly comprehends according to one ambit of simplicity, all the celestial kingdom itself, and all things that are contained under it, and binds them to themselves, by connective power and hyparxis. For in the things also that are apparent to sense, the concave circumference of the heavens, proximately compresses the elements, and does not suffer them in their indefinite motions on all sides, to be dissipated and blown away. And still prior to these, the celestial bulk strongly compresses and impels all things to the middle, and leaves no void place. But there is one comprehension of all these, viz. the back of the heavens, which is the cause to the heavens of similitude, and to the elements of contact with the heavens. For the smooth and equable nature of the back of the heavens as Timæus says, makes the whole of heaven similar to itself; and always the natures which comprehend are connective of the natures that are comprehended. It is necessary therefore from things that are apparent, to transfer the similitude to