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Naturalism is what we could call a worldview, a sort of total way of looking at ourselves and our world. It isn’t clearly a religion: the term "religion" is vague, and naturalism falls into the vague area of its application. Still, naturalism plays many of the same roles as a religion. In particular, it gives answers to the great human questions: Is there such a person as God? How should we live? Can we look forward to life after death? What is our place in the universe? How are we related to other creatures? Naturalism gives answers here: there is no God, and it makes no sense to hope for life after death. As to our place in the grand scheme of things, we human beings are just another animal with a peculiar way of making a living. Naturalism isn’t clearly a religion; but since it plays some of the same roles as a religion, we could properly call it a quasi-religion.

I never asserted so absurd a Proposition, as that any thing might arise without a Cause: I only maintained, that our Certainty of the Falsehood of that Proposition proceeded neither from Intuition nor Demonstration; but from another Source.

In science itself I certainly want to include the farthest flights of physics and cosmology, as well as experimental psychology, history, and the social sciences. Also, mathematics, insofar at least as it is applied, for it is indispensable to natural science. What then am I excluding as "some prior philosophy," and why? Descartes' dualism between mind and body is called metaphysics, but it could as well be reckoned as science, however false. He even had a causal theory of the interaction of mind and body through the pineal gland. If I saw indirect explanatory benefit in positing sensibilia, possibilia, spirits, a Creator, I would joyfully accord them scientific status too, on a par with such avowedly scientific positions as quarks and black holes. What then have I banned under the name of prior philosophy? ¶ Demarcation is not my purpose. My point in the characterization of naturalism ... is just that the most we can reasonably seek in support of an inventory and description of reality is testability of it observable consequences in the time-honored hypothetico-deductive way — whereof more anon. Naturalism need not cast aspersion on irresponsible metaphysics, however deserved, much less on soft sciences or on the speculative reaches of the hard ones, except insofar as a firmer basis is claimed for them than the experimental method itself.

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.

The process whereby man has come to know the universe is from one point of view extremely complicated; from another it is alarmingly simple. We can observe a single one-way progression. At the outset, the universe appears packed with will, intelligence, life, and positive qualities; every tree is a nymph and every planet a god. Man himself is akin to the gods. The advance gradually empties this rich and genial universe, first of its gods, then of it colours, smells, sounds and tastes, finally of solidity itself as solidity was originally imagined. As these items are taken from the world, they are transferred to the subjective side of the account: classified as our sensations, thoughts, images or emotions. The Subject becomes gorged, inflated, at the expense of the Object. But the matter does not rest there. The same method which has emptied the world now proceeds to empty ourselves. The masters of the method soon announce that we were just mistaken (and mistaken in much the same way) when we attributed "souls" or "selves" or "minds" to human organisms, as when we attributed Dryads to the trees. Animism, apparently, begins at home. We, who have personified all other things, turn out to be ourselves mere personifications. Man is indeed akin to the gods, that is, he is no less phantasmal than they. Just as the Dryad is a "ghost," an abbreviated symbol for certain verifiable facts about his behaviour: a symbol mistaken for a thing. And just as we have been broken of our bad habit of personifying tees, so we must now be broken of our habit of personifying men; a reform already effected in the political field. There never was a Subjective account into which we could transfer the items which the Subject had lost. There is no "consciousness" to contain, as images or private experiences, all the lost gods, colours, and concepts. Consciousness is "not the sort of noun that can be used that way."

We can never assert that, in principle, an event resists naturalistic explanation. A perfectly substantiated, anomalous event, rather than providing evidence for the supernatural, merely calls into question our understanding of particular natural laws. In the modern era, this position fairly accurately represents the educated response to novelty. Rather than invoke the supernatural, we can always adjust our knowledge of the natural in extreme cases. In the modern age in actual inquiry, we never reach the point where we throw up our hands and appeal to divine intervention to explain a localized event like an extraordinary experience.

Despite the occasional references to natural law and science both here and in the final chapter which might suggest otherwise, I intend my use of "natural" to entail (1) no commitments to a physicalistic ontology; (2) no valorization of the specific methods, vocabularies, presuppositions, or conclusions peculiar to natural science; (3) no view about the reducibility of the mental to the physical; (4) no position on the ontological status of logic or mathematics; and (5) no denial of the possibility of moral knowledge. Beliefs, values, and logical truths, for example, count as natural and folk psychological explanations, therefore, are natural explanations. The concept of the natural, in the sense I use it, has virtually no content except as the definitional correlative to the supernatural, taken here as a transcendent order of reality (and causation) distinct from the mundane order presupposed alike by the natural scientist and the rest of us in our quotidian affairs.