Key Definitions
Vicious Circularity:
A form of reasoning where a claim is supported only by restating the claim
itself. Example: “X is true because X is true.” This provides no genuine
justification.
Foundational (or Constitutive) Circularity:
A self-referential structure found in basic domains—like logic, perception, or
reason—where justification unavoidably relies on the very capacity being
justified. This is not a flaw but the point at which justification naturally
bottoms out.
Objective Morality:
The idea that moral truths exist independently of individual opinions, emotions,
or cultural norms, and can be valid for all rational agents.
Phenomenological Force:
The felt immediacy or self-evidence of a cognitive capacity—such as the way
logic, perception, or reasoning assert themselves experientially in our
thinking.
Moral Opacity:
The sense that the supposed foundation of morality does not reveal itself with
clarity or inevitability, making moral principles feel uncertain, variable, or
less self-evident than other foundational structures.
THE ARGUMENT
Not all circular reasoning is created equal. Some circles are vicious, such as “X is true because X is true.” Others are foundational: they mark the point where justification must stop because we have reached the standards that make justification possible in the first place. These are not argumentative failures but structural necessities.
We see this in several domains. Logic cannot be justified without using logical inference; perception cannot be validated without appealing to sensory experience; reason cannot be defended without presupposing rational norms. These are self-referential, but not therefore suspect. Their circularity is constitutive: they define what counts as justification.
If morality were like these capacities, then its self-grounding structure would not undermine it. Instead, it would signal that we had reached moral bedrock—a set of principles that do not need external support because they are the conditions under which moral reasoning operates.
Yet morality does not present itself with the same phenomenological clarity. We feel logic working; we feel the immediacy of sensory experience; we feel the necessity of reasoning. By contrast, moral intuition does not impose itself with equal inevitability. It varies across cultures, appears psychologically malleable, and often feels more like emotion or convention than like a foundational structure of thought.
This is why moral circularity strikes many people as suspicious rather than natural. The problem is not circularity itself but the opacity of the alleged foundation. Without the experiential force that accompanies logic, perception, or reason, morality’s self-reference can appear empty rather than fundamental.
Thus the central challenge of objective morality is not to avoid circularity—every basic domain has some. The challenge is to explain why, if morality is foundational, it does not manifest with the same self-evident force as our other basic cognitive capacities. Only then could moral circularity be understood as bedrock rather than as a flaw.