In two weeks, despite these notes, I shall no longer believe in what I am experiencing now. One must leave behind a trace of this journey which memory forgets. One must, when this is impossible, write or draw without responding to the romantic solicitations of pain, without enjoying suffering like music, tieing a pen to one's foot if need be, helping the doctors who can learn nothing from laziness.

Opium: The Diary of an Addict (ed. 1932)