But now suppose the last point of purpose to be introduced. It is said that this is not a mere useless hole bored through a mountain; but a hole bored for a particular purpose; it is, in fact, a railway tunnel. Then all difficulties would disappear. Of course, whether we believe the tunnel was actually made depends upon what evidence we have; but it is clear that when we consider the cause by which, and the purpose for which, it is said to have been made, there is nothing incredible about it.

Now a similar method must be adopted in regard to miracles. They must not be regarded simply as marvels, but as marvels said to have been brought about by an adequate cause, and for a sufficient purpose. And it is just these elements of cause and purpose which may make the marvels credible. We will consider these points in turn.

(1.) Miracles as marvels.

The first aspect of miracles is that of marvels. As such, they are events which seem to be contrary to our experience—contrary, that is, to what our experience of apparently similar events would lead us to expect. Suppose, for instance, it were stated that on one occasion three men were thrown into a furnace, but instead of being burnt to death they walked about, and in a few minutes came out alive and unhurt.

Such a marvel would be contrary to our experience, and that it would be therefore very improbable is obvious. But is this improbability sufficient in all cases to make the event incredible, no matter what testimony there may be in its favour? Hume's argument that it is sufficient is well known. He says we can only judge of the probability of anything, whether it be the occurrence of an event, or the truthfulness of the narrator, by experience. And as it is contrary to experience for miracles to be true, but not contrary to experience for testimony to be false, the balance of probability must always be against the miracle.

But of course this reasoning, if true, must apply to all alleged events which are contrary to experience; and yet such events have occurred by the thousand. Let us take a single example. Everyone has had some experience as to how far it is possible to hear the human voice distinctly, and till the last half century, the limit has always been fixed at a few hundred yards. Now, suppose anyone were told for the first time that it was possible to speak right across England, he would justly say that it was utterly contrary to experience. No one, he would think, could possibly speak loud enough to be heard even twenty miles away. But ought he to add that it was therefore incredible?

From this it is clear that there must be some flaw in Hume's argument; and it is easily discovered. For the argument regards the event only as a marvel, and without reference to its cause. But we have no right to leave this out of account, nor do we in ordinary affairs. When anyone first hears of a marvel, he does not merely compare it with his previous experience, and then come to a decision; in which case, as Hume supposes, it might be always against the marvel. But he first inquires how this strange event is said to have been brought about. For if any cause is stated to have been at work as to the influence of which he knows nothing, then he has no experience of the proper kind to appeal to. There is the testimony in favour of the event as before; and if he disbelieves it, he does so, not because it is contrary to his experience, but because he thinks the supposed cause either did not exist, or would not have had the effect asserted.

A reference to the previous example will make this quite plain. When the man first heard of persons talking across England, instead of at once declaring it incredible, he would, if a reasonable man, inquire as to the cause of this. He would then be told that a wire was stretched across England with an instrument called a telephone at each end. Now, as to the possibility or adequacy of such a contrivance he might doubt a good deal; but one thing would be quite clear, that this was a case to which his experience, however large, did not apply.

Here, then, is the explanation of Hume's argument. So long as a marvel, contrary to experience, is regarded only as a marvel, the probability must be always against its truth. But if we inquire as to how it was brought about, and find that some cause is said to have been at work, as to the influence of which we are ignorant, then the argument is no longer applicable. We have simply no experience of the proper kind to appeal to.

Now this is precisely the case with regard to miracles. As marvels they seem contrary to experience; but they claim to have a special cause, to be specially worked by God—that is to say, by some action on His part different from His usual action in nature; and of the influence of this cause we have no experience whatever. We may, of course, deny its existence or doubt its adequacy; but the argument, that the event is contrary to experience, vanishes.