Page "Universal pragmatics" Paragraph 54

:" With every speech act, by virtue of the validity claims it raises, the speaker enters into an interpersonal relationship of mutual obligation with the hearer: The speaker is obliged to support her claims with reasons, if challenged, and the hearer is obliged to accept a claim unless he has good reason not to do so.

The obligation in question is, in the first instance, not a moral one but a rational one -- the penalty of failure to fulfill it is the charge not of immorality but of irrationality -- although clearly the two will often overlap " ( Cooke, 1994 ).