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Beliefs always involve interpretations of reality, and interpretations involve the use of signs that are in principle public. The concept of a sign implies that there must be public criteria for applying the sign (meaning) as well as public criteria for applying it correctly (truth). Thus any belief, involving, as it does, interpretation by means of linguistic signs, which in tum imply public criteria for their use, implies validity claims to be both meaningful and true.

Wiki MarkupTo claim truth for any belief, a subject presupposes the possibility that some argumentative appeal to experiential evidence would command consensus about that belief among the members of an "unlimited argumentation community." So any truth claim "presupposes that certain rules of argumentation are to be followed as normative conditions for the very possibility of \ [discourse\], that is\[,\] of the consensual redemption or critique of truth claims" (Apel).  

The idea of an unlimited argumentation community implies a community of subjects each of whom would have ideal access to the experiential evidence for any understanding and would evaluate it accordingly, by "ideal, uncoerced argumentative appeal to evidence" according to common rules of argumentation and evidential standards (Mourad). The idea further implies that such a community "has at its disposal a sufficiently shared and clear language in which it can formulate not only its problems but also possible solutions to these problems" (Apel). 

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