If you spend much time involved in science/religion discussions, you will inevitably hear the term “scientism” thrown around. Usually it is hurled as an epithet. In practical terms, to be accused of scientism is usually to be accused of being insufficiently respectful of religion.
But I’ve never entirely understood what scientism actually is. The usual definition is that scientism is the blinkered belief that science is the only reliable “way of knowing,” but this is vague until we have sharp definitions of “science” and “way of knowing.” Philosophers have devoted no small amount of attention to trying to determine what “knowledge” is, without coming to a definitive conclusion. One standard definition is that knowledge is “justified, true belief,” but now you’re stuck trying to define what constitutes a justification.
In the context of science/religion discussions, this definitional morass seems supremely unhelpful. It’s far too abstract. The real issue is very simple. If you are going to make assertions about how the world is, then it is on you to provide evidence for that assertion. Then people can decide for themselves if they think your evidence is any good. What science (defined in some reasonable, everyday sense) provides is a set of investigative methods that everyone regards as legitimate. In this it differs from religion, which points to sources of evidence, such as personal experience or the contents of holy texts, that are considered by many to be of highly dubious validity.
At any rate, the occasion for discussing this is this recent post by Michael Ruse. He was responding to this earlier post from David Barash, which opened thusly:
I love science, and you should, too, if only because it provides us with the best (perhaps the only) way of genuinely knowing the world.
Ruse took exception to this, writing:
What on earth induces someone to say that? Of course, if you are talking about empirical matters it is true. You want to find out about geology, go to a scientist and not to the Bible. But there is so much more about genuine knowledge of the world that science simply doesn’t even touch.
Now, if you read Barash’s post you will find that he pretty clearly was considering empirical matters. The more pressing issue, though, is how we can claim to have knowledge of non-empirical things. What are these areas of genuine knowledge that science doesn’t even touch? Ruse provides three examples. Here’s the first:
Start with mathematics. It can be applied to the world, but does anyone really think that it is a matter of generalizing from experience? What about the Euler identity? It is true. It is beautiful. But what’s it about? To be honest, I am not quite sure what it is. As one who has an undergraduate degree in mathematics, I am half inclined to Platonism, thinking it describes an ideal world of ultimate reality. But one thing I do know. It isn’t science. (And if you object that because it is about an ideal world then it isn’t about our world, you still have the very non-scientific question of how claims about the ideal world apply to things going on in our physical world.)
This is a strange paragraph. Reducing science to “generalizing from experience” seems awfully limiting. I would have thought that mathematical modeling and deductive reasoning are part of the standard toolkit of science, meaning that mathematical knowledge is hardly a counterexample to scientism.
Moreover, it is not so clear that mathematics is not a matter of generalizing from experience. Mathematicians study abstract objects, but those objects, in most cases, originate from a consideration of the world. Take Ruse’s example of Euler’s identity, for example. We are talking about this equation:
\[
e^{i \pi}+1=0
\]
Where does this come from? Well, the idea of an exponential function is pretty clearly a generalization from experience. Nature provides numerous examples of exponential growth, after all. Likewise for the idea of a polynomial function, and it is through a study of their roots that people were led to formulate the notion of imaginary numbers. The number pi arises in a similar fashion. That the ratio of the circumference of a circle to its diameter is a constant is pretty clearly an empirical fact about the world.
Thus, the basic building blocks of Euler’s identity plainly arise as generalizations from experience. The next step is this: Once you have the separate ideas of real exponential functions and complex numbers, it makes sense to ask what a complex exponential function could look like. The standard definition
\[
e^{i \theta} = \cos \ \theta + i \sin \ \theta
\]
arises as a consequence of requiring that our complex exponential function be defined in a way that is consistent with what we know about real exponential functions. That is, it is a convention established because it is useful. Euler’s identity now follows as a logical consequence of that definition.
We come to know Euler’s identity first by defining certain abstract objects based on our contemplation of the world, then by establishing certain useful conventions for how we shall manipulate those objects, and then by applying deductive reasoning to discover previously unsuspected relationships among these objects and conventions. How is that not science? Which part of that is something that a scientist, in his professional role, could not do?
But just for the sake of argument let’s suppose we are absolutely determined to define our terms in such a way that mathematical knowledge is not part of science. Very well. Since I am happy to grant that mathematics provides knowledge, I will consider scientism to be refuted. In its place I will suggest a new notion called “scienceandmathematism,” which is defined as the idea that science and mathematics are the only reliable routes to knowledge. Happy now?
There is plenty more to comment on in Ruse’s paragraph, but let’s move on to his next example:
Go on to morality. Take the appalling story of the mother who shot herself and her children in a Texas welfare office. Everything that is coming out suggests that there was a dreadful breakdown of services there. I say the authorities should be ashamed of themselves; we as part of the society should all be ashamed of ourselves. I think this is true. It is about the world as much as the fact that the DNA molecule is a double helix. But it isn’t a scientific statement. David Hume taught us that you cannot justify matters of morality on the basis of matters of fact.
Even if we take that at face value, it’s a refutation of positivism, not scientism. The issue before us is not whether we can make meaningful but nonscientific statements about the world. Moral statements are only a refutation of scientism if you assert that we can learn their truth values by some method that isn’t scientific. From the way Ruse phrased this paragraph, it seems clear that he sees it as a statement of opinion, not of fact, that the authorities should be ashamed of themselves in this case. At least in this case, then, he is not asserting that we can have knowledge of, as opposed to strong opinions about, the truth or falsity of moral assertions.
As it happens, morality is an area where people claim there is a nonscientific route to knowledge. Many people argue, for example, that we learn facts about morality by reading the Bible. I know that Ruse has no sympathy for such claims. Moreover, science clearly has a big role to play in moral reasoning, by uncovering facts about the world that most people would regard as relevant to moral judgments. I wonder, then, why Ruse considers moral assertions to be such a devastating retort to Barash.
Here’s Ruse’s final example:
Continue with the kind of discussion we are having now. The very statement that science is the best and perhaps the only way to genuine knowledge of the world is no scientific statement. It is a meaningful statement and it is a meaningful statement about the world, but it isn’t something you are going to find under a microscope.
Once again, Ruse seems to be taking aim at positivism, not scientism. The issue here isn’t meaningfulness, it’s knowledge. Even if we grant that scientism is not itself the conclusion of a scientific investigation, that would not imply that scientism is false. It would only imply we could not know that it is true.
But why can’t we justify scientism on scientific grounds? I would think there is a plausible argument to be made that our confidence in scientism is an inductive inference from the persistent success of science coupled with persistent lack of success of all other routes to knowledge. Ruse earlier defined science as a generalization from experience. Is that not precisely the basis for a confident assertion of scientism?
Certainly the distinctively religious ways of knowing that people have suggested over the years have frequently proven themselves unreliable. Philosophical and ethical analysis are certainly valuable activities, but it seems strange to me to describe them as ways of knowing. What they provide is not knowledge, but clarity.
Ruse closes with this:
I have spent over 30 years fighting religious fanatics and am used to being roughed up by them. But increasingly I am noticing that scientists are arguing that if it isn’t science then it isn’t genuine. I should say that this is a two-way thing. I am shocked and ashamed of how many of my fellow philosophers don’t respect science and its achievements. I will get to this in the next week or so. For the moment, let me simply beg the scientific community not to fall into the trap of the religious and think that they uniquely have the answers to every question worth asking. The questions I posed above are really worth asking and if you disagree then it is back to John Stuart Mill yet again. Pigs and fools only think they know better because they are ignorant.
I simply have no idea what Ruse is talking about. How on earth does he go from Barash’s statement to the idea that scientists uniquely have the answer to every question worth asking? Who’s saying that? The issue isn’t which questions are and are not worth asking. Rather, the issue is how do we justify assertions that we “know” the answers to any of those questions. \Many questions are simultaneously worth asking and not answerable by science alone. To refute scientism, though, you need to show that they can be answered by methods that are not scientific. Ruse has not done that.
I don’t know what it means to say, “[I]f it isn’t science it isn’t genuine.” Genuine what? What I do know is that an assertion that science is the best, and perhaps the only, way of genuinely knowing the world is not a diss to the humanities. It certainly is not a rejection of mathematics, philosophy or ethical reasoning. And if you are going to argue that the assertion is false then it is your burden to point to a better way, and to indicate the knowledge provided by that alternate method.