Sigmund Freud,
A General Introduction to Psychoanalysis
“ Do not be surprised, then, to learn that occasionally even the physician takes the part of the illness he is battling against. He does not have to restrict himself to the role of the fanatic warrior for health in all situations of life. He knows that the world contains not only neurotic misery, but also real, incurable suffering. He knows that necessity may even require a human being to sacrifice his health, and he learns that by this sacrifice on the part of one individual untold wretchedness may be spared for many others. ”
