In the last paragraph of "Studies of Hysteria" (1893-1895) in the section of "Psychotherapy of Hysteria" (SE 2:305), Freud writes,
When I have promised my patients help or improvement by means of cathartic treatment I have often been faced by this objection: 'Why, you tell me yourself that my illness is probably connected with my circumstances and the events of my life. You cannot alter these in any way. How do you propose to help me then?' And I have been able to make this reply: 'No doubt your fate would find it easier than I do to relieve you of your illness. But you will be able to convince yourself that much will be gained if we succeed in transforming your hysterical misery into common unhappiness. With a mental life that has been restored to health you will be better armed against the unhappiness.'