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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.

One could retreat to a mere methodological naturalism and say that scientific method is our only hope as human beings. Whether or not we can adequately specify naturalism or know it to be true, one might say, the "scientific method" must be exclusively followed for human well-being. Naturalism would then be a humane proposal, not a philosophical claim. The proposal would be to assume in our inquiries that only the physical (or the empirical) exists and to see if inquiry based upon that assumption is not more successful in promoting human ends than any other type of inquiry.

Accusations of barren desolation, of promoting an arid and joyless message, are frequently flung at science in general ... But such very proper purging of saccharine false purpose; such laudable tough-mindedness in the debunking of cosmic sentimentality must not be confused with a loss of personal hope. Presumably there is indeed no purpose in the ultimate fate of the cosmos, but do any of us really tie our life's hopes to the ultimate fate of the cosmos anyway? Of course we don't; not if we're sane. Our lives are ruled by all sorts of closer, warmer, human ambitions and perceptions. To accuse science of robbing life of the warmth that makes it worth living is so preposterously mistaken, so diametrically opposite to my own feelings and those of most working scientists, I am almost driven to the despair of which I am wrongly suspected. ... The feeling of awed wonder that science can give is us one of the highest experiences of which the human psyche is capable. It is a deep aesthetic passion to rank with the finest that music and poetry can deliver. It is truly one of the things that makes life worth living and it does so, if anything, more effectively if it convinces us that the time we have for living it is finite.

At one level, the continuity of philosophy and empirical science is uncontentious. Many philosophical problems arise because of apparent tensions or conflicts within the assumptions which empirical evidence recommends to us. The most obvious examples are issues in the philosophy of science, such as problems about the interpretation of quantum mechanics, or the asymmetry of time, or the logic of natural selection. But other less specialist philosophical questions, like the existence of free will, also arise because of difficulties raised by empirical assumptions (in particular, in this case, by assumptions about the extent to which human beings are subject to the same laws of nature as the rest of the world).