"Regarding argument"
[...] Participants in argumentation have to presuppose in general that the structure of their communication, by virtue of features that can be described in purely formal terms, excludes all force—whether it arises from within the process of reaching understanding itself or influences it from the outside—except the force of the better argument (and thus that it also excludes, on their part, all motives except that of a cooperative search for the truth). [...]
(op. cit., p. 25)
J. Habermas (1992). Theory of Communicative Action Vol. 1: Reason and the Rationalisation of Society, Beacon Press, Boston