A well-known magazine asks a man how they should refer to him, as Psychologist X, as Author X? He suggests man of letters, for that is what he is, in the eighteenth-century meaning. But they can't buy that because the word doesn't exist in Time-style; he cannot be that, and presumably the old function of letters cannot exist.
Paul Goodman (2011). “Growing Up Absurd: Problems of Youth in the Organized Society”, p.133, New York Review of Books