Is science a tool for discovery or the only source of truth?

Ideas & Philosophy · Published 30 October 2026 Swipe more like this →

In short: Scientism is more than just a love for laboratory results; it is an expansive worldview that argues science is the exclusive gateway to knowledge. While scientific realism values empirical evidence, scientism pushes those boundaries until every human problem—from ethics to existence—is framed as a solvable technical equation.

At its core, scientism is often defined as 'scientific expansionism.' It posits that the boundaries of natural science should be expanded to encompass all areas of inquiry. In its most ambitious form, it suggests that science has no limits and will eventually solve every human problem. This distinguishes it from standard scientific realism; while a realist believes science provides a reliable account of the physical world, a scientist argues that only science can provide any knowledge at all.

Philosophers distinguish between two primary forms of this doctrine: epistemic and ontological scientism. Epistemic scientism is the belief that human knowledge is exhausted by what the scientific method can reveal. In contrast, ontological scientism claims that only the reality accessible to science actually exists—often reducing everything in the universe to material particles and their interactions. Crucially, one can believe in epistemic scientism without accepting the ontological version; you can argue that we cannot know things outside of science while still believing those things exist.

Critics point out several nuances in this worldview. For instance, social sciences aim for objective knowledge but are often influenced by societal interests, unlike exact sciences. Furthermore, the history of scientific theory shows significant discontinuities, suggesting that data does not always lead to a straightforward path toward truth. Historically, movements like scientism have been viewed as threats to sacred revelations or traditional religions because they suggest human reason has no frontiers, potentially rendering non-scientific truths unfounded.

The tension lies in the 'domain' of science. Critics argue that scientism confuses efficient causes with final causes—taking a method designed for one area and applying it to others where its utility is unproven. By treating all phenomena as reducible to scientific data, scientism risks overlooking aspects of human experience that may be fundamentally non-reducible.

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