Reaching and understanding is the process of bringing about an agreement on the presupposed basis of validity claims that are mutually recognized. - Jürgen Habermas

The speaker must choose a comprehensible [verständlich] expression so that speaker and hearer can understand one another.

[According to Habermas, the genesis of the bourgeois public sphere resulted from a combination of early capitalist commercial development and the organization of territorial … Representative publicness involved a re-presenting or staging for the purposes of display and acclamation, hence] this publicness (or publicity) of representation was not constituted as a social realm, that is, as a public sphere; rather, it was something like a status attribute, if this term may be permitted.

If we compare the third-person attitude of someone who simply says how things stand (this is the attitude of the scientist, for example) with the performative attitude of someone who tries to understand what is said to him (this is the attitude of the interpreter, for example), the implications … become clear. … First, interpreters relinquish superiority that observers have by virtue of their privileged position, in that they themselves are drawn, at least potentially, into negotiations about the meaning and validity of utterances. By taking part in communicative action, they accept in principle the same status as those whose utterances they are trying to understand. … It is impossible to decide a priori who is to learn from whom.