“It is not suffering as such that is most deeply feared but suffering that degrades.”
Susan Sontag book AIDS and Its Metaphors
AIDS and Its Metaphors, (1989), ch. 4, p. 125, Farrar, Straus and Giroux ISBN 0-312-42013-7
AIDS and Its Metaphors was later published in combination with Illness As Metaphor. This combined edition is the one referenced here.