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In a similar way we may conceive that progress may be made in natural theology in either of two ways: by deducing consequences from what we know or observe, or by assuming for trial the truth of a statement made on whatever authority it may be, and then examining whether the supposition of its truth so falls in with such knowledge as we possess, or such phenomena as we observe, as to lead us to a conviction that the statement does indeed express the truth. It may be that the statement comes from a source which professes to be a revelation made from God to man. But such an employment of it as I have just described is strictly analogous to our procedure in the study of physical science, and does not therefore seem to be precluded by the terms of the foundation of this lectureship.

Now he that sees, perceives that he sees; and he that hears, that he hears; and he that walks, that he walks; and in every other case, in the same manner, there is some faculty which perceives that we are energizing; so that we perceive that we are perceiving, and understand that we are understanding. But this is the same as saying that we perceive or understand that we exist; for existence was defined to be perceiving, or understanding. Now, to perceive that one is alive, is of the number of those things which are pleasant in themselves: for life is a good by nature: and to perceive the good which is inherent in one's self is pleasant. But life is eligible, and particularly to the good, because existence is to them good and pleasant; for by the consciousness of that which is absolutely a good, they are pleased.

Luke: Are you still believin' in that big bearded Boss up there? You think he's watchin' us? Dragline: Get in here. Ain't ya scared? Ain't ya scared of dyin'? Luke: Dyin'? Boy, he can have this little life any time he wants to. Do ya hear that? Are ya hearin' it? Come on. You're welcome to it, ol' timer. Let me know you're up there. Come on. Love me, hate me, kill me, anything. Just let me know it. ... I'm just standin' in the rain talkin' to myself.

On the other side, the hypothesis of divine creation is very unlikely. Although if there were a god with the traditional attributes and powers, he would be able and perhaps willing to create such a universe as this, we have to weigh in the scales the likelihood or unlikelihood that there is a god with these attributes and powers. And the key power ... is that of fulfilling intentions directly, without any physical or causal mediation, without materials or instruments. There is nothing in our background knowledge that makes it comprehensible, let alone likely, that anything should have such a power. All our knowledge of intention-fulfillment is of embodied intentions being fulfilled indirectly by way of bodily changes and movements which are causally related to the intended result, and where the ability thus to fulfill intentions itself has a causal history, either of evolutionary development or of learning or of both. Only by ignoring such key features do we get an analogue of the supposed divine action.

So yes, my arguments might give us reason to prefer natural explanations when these are available, and to seek natural explanations when they are not. It follows that a proposed theistic explanation should be, at best, an explanation of last resort. One might argue that this view — that we should abandon the search for natural explanations only in extremis — represents a kind of "presumption of naturalism." And so it does. ¶ My own view is that the naturalistic research tradition of the sciences has been stunningly successful and must rank as one of the greatest of human achievements. But I think it is poorly served by attempts to define science in such a way as to exclude the supernatural. The debate over intelligent design is instructive in this regard. One might win a legal victory by insisting that this proposed theistic explanation is not what we customarily call "science." And this is true, for contingent historical reasons. But it would be much more effective to show that this particular proposed theistic explanation, with its deliberately vague appeal to an unspecified "designer," is practically vacuous. it lacks the first and most important virtue of any proposed explanation, namely that of testability. It follows that this particular proposed theistic explanation should be rejected. ¶ Could the theist produce a better one? I doubt it, but then it would be most regrettable if we were to forbid him to try. Nothing could be more antithetical to the spirit of free enquiry than this kind of censorship. If proposed theistic explanations are to be defeated, as they have been so often in the past, it will be by way of the free contest of ideas.

Our textbooks like to illustrate evolution with examples of optimal design — nearly perfect mimicry of a dead leaf by a butterfly or of a poisonous species by a palatable relative. But ideal design is a lousy argument for evolution, for it mimics the postulated action of an omnipotent creator. Odd arrangements and funny solutions are the proof of evolution — paths that a sensible God would never tread but that a natural process, constrained by history, follows perforce.

The existence of our universe might be explained by scientific cosmology, but such an explanation would still have to refer to features of some larger reality that contained or gave rise to it. A scientific explanation of the Big Bang would not be an explanation of why there was something rather than nothing, because it would have to refer to something from which that event arose. This something, or anything else cited in a further scientific explanation of it, would then have to be included in the universe whose existence we are looking for an explanation of when we ask why there is anything at all. This is a question that remains after all possible scientific questions have been answered.

The reason we are led to the hypothesis of a designer by considering both the watch and the eye is that these are complex physical structures that carry out a complex function, and we cannot see how they could have come into existence out of unorganized matter purely on the basis of the purposeless laws of physics. For the elements of which they are composed to have come together in just this finely tuned way purely as a result of physical and chemical laws would have been such an improbable fluke that we can regard it in effect as impossible: The hypothesis of chance can be ruled out. But God, whatever he may be, is not a complex physical inhabitant of the natural world. The explanation of his existence as a chance concatenation of atoms is not a possibility to which we must find an alternative, because that is not what anybody means by God. If the God hypothesis makes sense at all, it offers a different kind of explanation from those of physical science: explanation by the purpose or intention of a mind without a body, capable nevertheless of creating and forming the entire physical world. The point of the hypothesis is to claim that not all explanation is physical, and that there is a mental, purposive, or intentional explanation more fundamental even than the basic laws of physics, because it explains even them.

There is a crucial difference between these two cases. All other integrations into a super-science, of sciences dealing with entities and properties apparently qualitatively very distinct, was achieved by saying that really some of the entities and properties were not as they appeared to be; by making a distinction between the underlying (not immediately observable) entities and properties and the phenomenal properties to which they give rise. Thermodynamics was conceived with the laws of temperature exchange; and temperature was supposed to be a property inherent in an object. The felt hotness of a hot body is indeed qualitatively distinct from particle velocities and collisions. The reduction was achieved by distinguishing between the underlying cause of the hotness (the motion of the molecules) and the sensations which the motion of molecules cause in observers. The former falls naturally within the scope of statistical mechanics — for molecules are particles; the entities and properties are not now of distinct kinds. But this reduction has been achieved at the price of separating off the phenomenal from its causes, and only explaining the latter.

Computers function as they do because they have been constructed by human beings endowed with rational insight. And the results of their computations are accepted because they are evaluated by rational human beings as conforming to rational norms. A computer, in other words, is merely an extension of the rationality of its designers and users, it is no more an independent source of rational insight than a television set is an independent source of news and entertainment.