Is the universe turtles all the way down, or does it have a foundation?
In short: An infinite regress occurs when a theory relies on a chain of explanations that never ends. While often dismissed as a logical failure, philosophers debate whether these chains are truly vicious or simply misunderstood. Discover how thinkers from Aristotle to modern epistemologists attempt to stop the cycle of endless justification.
An infinite regress is a series of entities where each depends on its predecessor, governed by a recursive principle. For example, in the epistemic regress, a belief is justified only by another justified belief, which requires its own justification, and so on. If the chain never terminates, the theory faces a potential crisis. Traditionally, philosophers assumed any such regress was vicious—a fatal flaw—but contemporary thought is more nuanced, distinguishing between benign regresses and those that are metaphysically impossible or simply implausible.
The most serious regresses involve metaphysical impossibility, often rejected by those who deny the existence of actual infinities. However, most arguments against regresses focus on implausibility or explanatory failure. The classic 'turtles all the way down' analogy illustrates a global failure: while it might locally explain why the earth rests on a turtle, it fails to explain why anything rests at all, as it merely pushes the requirement for support to the next turtle. Similarly, Gilbert Ryle argued that mind-body dualism is implausible because it creates an infinite regress of 'inner observers' to explain how mental states influence physical ones.
To avoid these traps, philosophers typically turn to foundationalism or coherentism. Foundationalism posits a first element—a non-inferentially justified belief or a fundamental level of reality—that requires no further explanation. Aristotle famously argued that not all knowledge can be demonstrative, as we must eventually reach indemonstrable primary premises. Alternatively, coherentism, championed by thinkers like Laurence BonJour, rejects the linear chain entirely. Instead, it views justification as a holistic network where beliefs are justified by how well they hang together as a system, rather than by a single, foundational starting point.
Ultimately, the status of a regress often depends on one's explanatory goals. While some regresses, like the truth-regress—where 'P' implies 'It is true that P'—are considered benign, others are used to argue for specific theories, such as the cosmological argument for God as a first cause. Whether these regresses are vicious or virtuous remains a central tension in how we structure our understanding of knowledge and reality.
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- Summary by Intellect · source: Infinite regress
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