" (...) and, though I'm hardly a judge, I think that's the worse motive you've given yet for being the wife of young Linton."

"It is not," retorted she, "it is the best! The others were the satisfaction of my whims; and for Edgar's sake, too, to satisfy him. This is for the sake of one who comprehends in his person my feelings to Edgar and myself. I cannot express it; but surely you and every body have a notion that there is, or should be, an existence of yours beyond you. What were the use of my creation if I were entirely contained here? My great miseries in this world have been Heathcliff's miseries, and I watched and felt each from the beginning; my great thought in living is himself. If all else perished, and he remained, I should still continue to be; and, if all else remained, and he were annihilated, the Universe would turn to a mighty stranger. I should not seem a part of it. My love for Linton is like the foilage in the woods. Time will change it, I'm well aware, as winter changes the trees - my love for Heathcliff resembles the eternal rocks beneath - a source of little visible delight, but necessary. Nelly, I am Heathcliff - he's always, always in my mind - not as a pleasure, any more than I am always a pleasure to myself - but, as my own being (...). "

Nelly & Catherine Earnshaw (pages 81-82, ed. by Ian Jack)