[…] it is important to revert to definitely unilingual situations where the different members of the community are not aware of any such deviation in the speech of others or in their own as could be dubbed ‘accent’ or ‘dialect’. In these the communicative ideal of language is fully realized: it is really does not matter in the least whether the speech of one man is physically identical with that of another provided possible divergences do not interfere with the free and easy trasmission of experience. In this respect it is quite essential that all participants should be intimately convinced that they speak ‘the same language’: since language is constantly redundant, words having generally more phonemes than is strictly necessary to keep them distinct from others in a given contexts, and messages being as a rule more profuse than logic would demand, a few divergences will not prevent not even impair mutual understanding.
- Martinet (1962), Pag. 108-109