One of the most striking contrasts between the art of the Catacombs and that of later times is the entire absence in the former of those gross anthropomorphic images of the persons of the Holy Trinity, either together or separately--except Our Lord under his proper human form--of which the latter, in striking offence against piety and good taste, exhibits so many painful examples. In the earlier ages a solemn reverence forbade the attempt to depict the Eternal Father or the Holy Spirit except by means of symbolical types. The universal testimony of Christian antiquity is opposed to this practice so common in Mediæval art. Origen, Ambrose, and Augustine unite in prohibiting the representation of the Deity by any material object. The latter declares it to be impious for any Christian to set up such an image in the church, and much more to do it in his heart,[591] or to conceive it possible that the Divine Being may be circumscribed by the limits of the human frame.[592] Paulinus of Nola, in his account of the symbolism of the Holy Trinity in the church of St. Felix, describes Christ as represented by a lamb, the Holy Spirit by a dove, but for the Father nothing but a voice from heaven.[593] Gregory II., the 353 champion of image-worship, denies that it is lawful to make any representation of the Divine nature, but only of Our Lord, his mother, and the saints.[594] Such figures were also condemned by the second Council of Nice.[595] John Damascenus, a zealous defender of the images of Christ and the saints, yet declares it is as great impiety as it is folly to make any image of the Divine nature, which is incorporeal, invisible, without material or form, incomprehensible, not to be circumscribed, nor to be figured by the art of man.[596] Urban VIII. ordered all representations of the Trinity to be burnt, and Benedict XIV. forbade the depicting of the Holy Ghost in human form. Dupin asserts that the most zealous defenders of images have condemned these;[597] and the learned and judicious Bingham declares that “in all ancient history we never meet with any one instance of picturing God the Father, because it was supposed that he never appeared in any visible shape, but only by a voice from heaven.”[598] Some recent Roman Catholic writers, however, assert the contrary of this to be the case, and refer for proof of the assertion to one or 354 two sarcophagal bas reliefs of the fourth or fifth century. One of these represents Cain and Abel bringing their gifts to an aged and bearded figure sitting on a stone, who is interpreted by the Romanists as the Omnipotent Jehovah. But that distinguished archæologist, Raoul Rochette, himself a Romanist, opposes this view. “I doubt,” he says, “the reality of this explanation, contrary to all that we know of the Christian monuments of the first ages, where the intervention of the Eternal Father is only indicated in the abridged and symbolic manner proper to antiquity, by the image of a hand.”