We all speak an idiolect. From our parents and their friends we inherit a dialect. Then as we progress through life other dialects impinge on us influencing our speech. We may use different dialects in different circumstances. We may travel to other countries and have other languages influence our idiolect.
Some people acquire second, third and even fourth languages.
All influencing each other. It is the words that we talk to ourselves in our head that make up our idiolect. This is the true voice of the poet. As Wordsworth would have thought it. Pierre Joris visualises the poet as a nomad passing alone through the languages of the world and only alone in the silence of his head.