What counts as rational argumentation is as historically determined and as context-dependent, as what counts as good French.
Richard RortyThere is nothing to be known about anything except an initially large, and forever expandable, web of relations to other things. Everything that can serve as a term of relation can be dissolved into another set of relations, and so on for ever. There are, so to speak, relations all the way down, all the way up, and all the way out in every direction: you never reach something which is not just one more nexus of relations.
Richard RortyTo say that truth is not out there is simply to say that where there are no sentences there is no truth, that sentences are elements of human languages, and that languages are human creations.~ The suggestion that truth~ is out there is a legacy of an age in which the world was seen as the creation of a being who had a language his own.
Richard RortyThe world does not speak. Only we do. The world can, once we have programmed ourselves with a language, cause us to hold beliefs. But it cannot propose a language for us to speak. Only other human beings can do that.
Richard Rorty