Nevertheless, by the principle of the Thomist philosophy above cited, that the lowest point of any nature touches the highest of the nature beneath it, there may be something even in the spiritual operation of the angels cognate to material operation, and coming within the sphere of the sensible. We will venture to give a little sample of scholastic theology on this head from Billuart. "It may be said with reason that the angels operate two things in the celestial empyrean. The first is the illumination by which the intrinsic splendor of the empyrean is perfected, according to St. Thomas and various testimonies of Holy Scripture in which certain places are said to have been sensibly illuminated by the angels. For although an angel cannot immediately produce alterative qualities, as heat or cold, he can produce light, because light is a celestial quality and the highest of corporeal qualities, and the summit of the inferior nature is touched by the superior nature. "In the second place, the angels operate on the empyrean heaven, so that it may more perfectly and efficaciously communicate a suitable perpetuity and stability to all inferior things. For as the supreme angels who are permanently stationed there have an influence over the intermediate and lowest angels who are sent forth, although they themselves are not sent forth, so the empyrean heaven, although it is itself motionless, communicates to those things which are in motion the requisite stability and permanence in their being. And that this may be done more efficaciously and permanently the angels aid by their operation in it. For, the whole universe is one in unity of order; and this unity of order consists in that by a certain arrangement corporeal things are regulated by those which are spiritual, and inferior bodies by the superior; therefore, as this order demands that the empyrean spheres influence the inferior ones, it demands also that the angels influence the empyrean sphere." [Footnote 8] [Footnote 8: De Angelis. Diss. IL Art. I.] {12} Whatever may be thought of this as philosophy, it is certainly brilliantly poetical, as is the whole treatise of the learned Dominican from which it is extracted. The physical theory of the universe maintained by the scholastics was a magnificent conception, although it has been supplanted by a sounder scientific hypothesis. There appears to be no reason, however, for rejecting the notion of angelic influence over the movement of the universe. The modern hypothesis of a central point of revolution for the universe being substituted for the ancient one of the empyrean, the entire scholastic theory of the influence of the angels upon the exterior order of the universe may remain untouched in its intrinsic probability.