The evolution of demons and devils out of deities was made real to the popular imagination in every country where the new religion found art existing, and by alliance with it was enabled to shape the ideas of the people. The theoretical degradation of deities of previously fair association could only be completed where they were presented to the eye in repulsive forms. It will readily occur to every one that a rationally conceived demon or devil would not be repulsive. If it were a demon that man wished to represent, mere euphemism would prevent its being rendered odious. The main characteristic of a demon--that which distinguishes it from a devil--is, as we have seen, that it has a real and human-like motive for whatever evil it causes. If it afflict or consume man, it is not from mere malignancy, but because impelled by the pangs of hunger, lust, or other suffering, like the famished wolf or shark. And if sacrifices of food were offered to satisfy its need, equally we might expect that no unnecessary insult would be offered in the attempt to portray it. But if it were a devil--a being actuated by simple malevolence--one of its essential functions, temptation, would be destroyed by hideousness. For the work of seduction we might expect a devil to wear the form of an angel of light, but by no means to approach his intended victim in any horrible shape, such as would repel every mortal. The great representations of evil, whether imagined by the speculative or the religious sense, have never been, originally, ugly. The gods might be described as falling swiftly like lightning out of heaven, but in the popular imagination they retained for a long time much of their splendour. The very ingenuity with which they were afterwards invested with ugliness in religious art, attests that there were certain popular sentiments about them which had to be distinctly reversed. It was because they were thought beautiful that they must be painted ugly; it was because they were--even among converts to the new religion--still secretly believed to be kind and helpful, that there was employed such elaboration of hideous designs to deform them. The pictorial representations of demons and devils will come under a more detailed examination hereafter: it is for the present sufficient to point out that the traditional blackness or ugliness of demons and devils, as now thought of, by no means militates against the fact that they were once the popular deities. The contrast, for instance, between the horrible physiognomy given to Satan in ordinary christian art, and the theological representation of him as the Tempter, is obvious. Had the design of Art been to represent the theological theory, Satan would have been portrayed in a fascinating form. But the design was not that; it was to arouse horror and antipathy for the native deities to which the ignorant clung tenaciously. It was to train children to think of the still secretly-worshipped idols