But while they commonly discard the hypothesis of a deity as an explanation of all the particular processes of nature, they retain it as an explanation of nature in general.
When philosophy and science by their combined efforts have ejected gods and goddesses from all the subordinate posts of nature, it might perhaps be expected that they would have no further occasion for the services of a deity, and that having relieved him of all his particular functions they would have arranged for the creation and general maintenance of the universe without him by handing over these important offices to an efficient staff of those ethers, atoms, corpuscles, and so forth, which had already proved themselves so punctual in the discharge of the minor duties entrusted to them. Nor, indeed, is this expectation altogether disappointed. A number of atheistical philosophers have courageously come forward and assured us that the hypothesis of a deity as the creator and preserver of the universe is quite superfluous, and that all things came into being or have existed from eternity without the help of any divine spirit, and that they will continue to exist without it to the end, if end indeed there is to be. But on the whole these daring speculators appear to be in a minority. The general opinion of educated people at the present day, could we ascertain it, would probably be found to incline to the conclusion that, though every department of nature is now worked by impersonal material forces alone, the universe as a whole was created and is still maintained by a great supernatural spirit whom we call God. Thus in Europe and in the countries which have borrowed their civilisation, their philosophy, and their religion from it, the central problem of natural theology has narrowed itself down to the question, Is there one God or none? It is a profound question, and I for one profess myself unable to answer it.
Whether attained by inward or outward experience, the idea of God is regularly that of a cause inferred, not perceived.
If this brief sketch of the history of natural theology is correct, man has by the exercise of his natural faculties alone, without the help of revelation, attained to a knowledge or at least to a conception of God in one of two ways, either by meditating on the operations of his own mind, or by observing the processes of external nature: inward experience and outward experience have conducted him by different roads to the same goal. By whichever of them the conception has been reached, it is regularly employed to explain the causal connexion of things, whether the things to be explained are the ideas and emotions of man himself or the changes in the physical world outside of him. In short, a God is always brought in to play the part of a cause; it is the imperious need of tracing the causes of events which has driven man to discover or invent a deity. Now causes may be arranged in two classes according as they are perceived or unperceived by the senses. For example, when we see the impact of a billiard cue on a billiard ball followed immediately by the motion of the ball, we say that the impact is the cause of the motion. In this case we perceive the cause as well as the effect. But, when we see an apple fall from a tree to the ground, we say that the cause of the fall is the force of gravitation exercised by the superior mass of the earth on the inferior mass of the apple. In this case, though we perceive the effect, we do not perceive the cause, we only infer it by a process of reasoning from experience. Causes of the latter sort may be called inferential or hypothetical causes to distinguish them from those which are perceived. Of the two classes of causes a deity belongs in general, if not universally, to the second, that is, to the inferential or hypothetical causes; for as a rule at all events his existence is not perceived by our senses but inferred by our reason. To say that he has never appeared in visible and tangible form to men would be to beg the question; it would be to make an assertion which is incapable of proof and which is contradicted by a multitude of contrary affirmations recorded in the traditions or the sacred books of many races; but without being rash we may perhaps say that such appearances, if they ever took place, belong to a past order of events and need hardly be reckoned with at the present time. For all practical purposes, therefore, God is now a purely inferential or hypothetical cause; he may be invoked to explain either our own thoughts and feelings, our impulses and emotions, or the manifold states and processes of external nature; he may be viewed either as the inspirer of the one or the creator and preserver of the other; and according as he is mainly regarded from the one point of view or the other, the conception of the divine nature tends to beget one of two very different types of piety. To the man who traces the finger of God in the workings of his own mind, the deity appears to be far closer than he seems to the man who only infers the divine existence from the marvellous order, harmony, and beauty of the external world; and we need not wonder that the faith of the former is of a more fervent temper and supplies him with more powerful incentives to a life of active devotion than the calm and rational faith of the latter. We may conjecture that the piety of most great religious reformers has belonged to the former rather than to the latter type; in other words, that they have believed in God because they felt, or imagined that they felt, him stirring in their own hearts rather than because they discerned the handiwork of a divine artificer in the wonderful mechanism of nature.
Besides the two sorts of gods already distinguished, namely natural gods and living human gods, there is a third sort which has played an important part in history, namely, the spirits of deified dead men. Euhemerism.
Thus far I have distinguished two sorts of gods whom man discovers or creates for himself by the exercise of his unaided faculties, to wit natural gods, whom he infers from his observation of external nature, and human gods or inspired men, whom he recognises by virtue of certain extraordinary mental manifestations in himself or in others. But there is another class of human gods which I have not yet mentioned and which has played a very important part in the evolution of theology. I mean the deified spirits of dead men. To judge by the accounts we possess not only of savage and barbarous tribes but of some highly civilised peoples, the worship of the human dead has been one of the commonest and most influential forms of natural religion, perhaps indeed the commonest and most influential of all. Obviously it rests on the supposition that the human personality in some form, whether we call it a soul, a spirit, a ghost, or what not, can survive death and thereafter continue for a longer or shorter time to exercise great power for good or evil over the destinies of the living, who are therefore compelled to propitiate the shades of the dead out of a regard for their own safety and well-being. This belief in the survival of the human spirit after death is world-wide; it is found among men in all stages of culture from the lowest to the highest; we need not wonder therefore that the custom of propitiating the ghosts or souls of the departed should be world-wide also. No doubt the degree of attention paid to ghosts is not the same in all cases; it varies with the particular degree of power attributed to each of them; the spirits of men who for any reason were much feared in their lifetime, such as mighty warriors, chiefs, and kings, are more revered and receive far more marks of homage than the spirits of common men; and it is only when this reverence and homage are carried to a very high pitch that they can properly be described as a deification of the dead. But that dead men have thus been raised to the rank of deities in many lands, there is abundant evidence to prove. And quite apart from the worship paid to those spirits which are admitted by their worshippers to have once animated the bodies of living men, there is good reason to suspect that many gods, who rank as purely mythical beings, were once men of flesh and blood, though their true history has passed out of memory or rather been transformed by legend into a myth, which veils more or less completely the real character of the imaginary deity. The theory that most or all gods originated after this fashion, in other words, that the worship of the gods is little or nothing but the worship of dead men, is known as Euhemerism from Euhemerus, the ancient Greek writer who propounded it. Regarded as a universal explanation of the belief in gods it is certainly false; regarded as a partial explanation of the belief it is unquestionably true; and perhaps we may even go further and say, that the more we penetrate into the inner history of natural religion, the larger is seen to be the element of truth contained in Euhemerism. For the more closely we look at many deities of natural religion, the more distinctly do we seem to perceive, under the quaint or splendid pall which the mythical fancy has wrapt round their stately figures, the familiar features of real men, who once shared the common joys