If the reader should here meet with any thing which he had not before attended to, it will not be in the observations upon the constitution and course of nature, these being all obvious, but in the application of them; in which, though there is nothing but what appears to me of some real weight, and therefore of great importance, yet he will observe several things, which will appear to him of very little, if he can think things to be of little importance, which are of any real weight at all, upon such a subject of religion. However, the proper force of the following treatise lies in the whole general analogy considered together. It is come, I know not how to be taken for granted, by many persons, that Christianity is not so much as a subject of inquiry; but that it is, now at length, discovered to be fictitious. Accordingly they treat it, as if, in the present age, this were an agreed point among all people of discernment; and nothing remained, but to set it up as a principal subject of mirth and ridicule, as it were by way of reprisals, for its having so long interrupted the pleasures of the world. On the contrary, thus much at least, will be here found, not taken for granted but proved, that any reasonable man, who will thoroughly consider the matter, may be as much assured, as he is of his own being, that it is not so clear a case, that there is nothing in it. There is, I think, strong evidence of its truth; but it is certain no one can, upon principles of reason, be satisfied of the contrary. The practical consequence to be drawn from this, is not attended to by every one who is concerned in it. _May, 1736._ INTRODUCTION. Probable evidence is essentially distinguished from demonstrative by this, that it admits of degrees; and of all variety of them, from the highest moral certainty, to the very lowest presumption. We cannot indeed say a thing is probably true upon one very slight presumption for it; because, as there may be probabilities on both sides of a question, there may be some against it; and though there be not, yet a slight presumption does not beget that degree of conviction, which is implied in saying a thing is probably true. But that the slightest possible presumption is of the nature of a probability, appears from hence; that such low presumption, often repeated, will amount even to moral certainty. Thus a man’s having observed the ebb and flow of the tide to-day, affords some sort of presumption, though the lowest imaginable, that it may happen again to-morrow: but the observation of this event for so many days, and months, and ages together, as it has been observed by mankind, gives us a full assurance that it will.