Before Odysseus navigates the rocks on which live Scylla and Charybdis he is lulled by the Sirens, promising advance disclosure of earthly adventures. Forewarned by Circe, he enjoins his crew first to contain him; later (on pain of death) to release him from the mast to which he is bound. Held to his originally expressed wishes, they refuse, and bind him more tightly. In this way, Odysseus creates what may have been one of the first advance directives. Its enforcement illustrates one of the concerns which have latterly been expressed about making binding health care choices, possibly many years before they might take effect

‘People do not always mean what they say; they do not always say what they want; and they do not always want what they say they want. That much is, if not exactly clear, at least uncontroversial. What is controversial is, recognizing this, how to proceed.’