Fooled by Reason

A framework revealing how reason itself can mislead—not because it's irrational, but because it's used selectively, applied inconsistently, or trusted beyond its limits. Fooled by Reason shows how we can reason our way to false conclusions by starting from false premises, how we can rationalize anything if we try hard enough, and how the appearance of reason can mask the absence of wisdom. We are fooled when we trust reasoning without examining its starting points, when we mistake rationalization for rationality.

Fooled by Reason "He reasoned his way to a conclusion that justified everything he already believed. Fooled by Reason: using reason to rationalize, not to discover. The reasoning was flawless; the premises were false. Reason fooled him into thinking he'd found truth when he'd only found justification."

by Dumu The Void March 8, 2026

Fallacy of Impossible Reason

A close cousin to impossible rationality, this fallacy demands that an opponent's reasoning process be flawless, complete, and self-contained according to an impossibly strict standard before it can be engaged with. It's the "gotcha" of pointing out that an argument has unstated premises, that it relies on some assumptions, or that it isn't mathematically formalized—as if any human communication could meet such standards. The fallacy lies in using the inevitable gaps and imperfections in all reasoning as an excuse to reject the reasoning entirely, rather than engaging with its substance. It turns the legitimate observation that "no argument is perfect" into the illegitimate conclusion that "therefore no argument is worthwhile."

Example: "He demanded I write my position as a series of formal logical propositions with every premise explicitly stated—a Fallacy of Impossible Reason designed to make conversation so tedious I'd just give up."

by Dumu The Void March 11, 2026

Principle of Relative Reason

A meta‑principle that what counts as good reasoning is relative to a framework of norms, goals, and contexts. There is no single universal standard of rationality; instead, reasoning is judged by its appropriateness to the specific domain (science, law, ethics, daily life). It challenges monistic accounts of rationality.

Principle of Relative Reason Example: “The principle of relative reason explains why Bayesian reasoning works for statistics but not for existential decisions—different domains have different rationalities.”

by Abzugal Nammugal Enkigal March 24, 2026

Principle of Spectral Reason

A principle that reasoning can be evaluated on a spectrum from “very reasonable” to “very unreasonable” rather than a binary rational/irrational. It allows for degrees of reasonableness, recognizing that arguments can be partially cogent, contextually sound, or more or less justified.

Principle of Spectral Reason Example: “His proposal wasn’t fully rational or fully irrational; under the principle of spectral reason, it was moderately reasonable given the constraints.”

by Abzugal Nammugal Enkigal March 24, 2026

Principle of Infinite Reason

A principle that there are infinitely many forms of reason, each with its own standards, and that reasoning itself can be infinite in its iterations (e.g., recursive justification). It rejects the idea that reason has a finite foundation or a single set of rules, embracing the open‑endedness of rational inquiry.

Principle of Infinite Reason Example: “The principle of infinite reason reminds us that every ‘why’ can be met with another ‘why’—justification is potentially endless.”

by Abzugal Nammugal Enkigal March 24, 2026

Principle of Contextual Reason

A principle that the standards of good reasoning are shaped by the context—the purposes, background assumptions, and situational constraints. What is reasonable in a hurried emergency is not the same as what is reasonable in a philosophical seminar. Contextual reason emphasizes pragmatic adaptability.

Principle of Contextual Reason Example: “In a crisis, intuitive snap decisions are reasonable; in academic research, the same reasoning would be condemned. Contextual reason explains why.”

by Abzugal Nammugal Enkigal March 24, 2026

Principle of Perspective Reason

A principle that reason is always exercised from a particular standpoint, and that what appears reasonable from one perspective may appear unreasonable from another. It encourages reflexivity about the situatedness of our reasoning practices and the recognition that different perspectives can each have their own internal rationality.

Example: “The principle of perspective reason helps us understand why two experts with different training can honestly reach opposite conclusions—their reasoning is rational from their respective perspectives.”

by Abzugal Nammugal Enkigal March 24, 2026