Reason, indeed, may oft complain For Nature's sad reality, And tell the suffering heart, how vain Its cherished dreams must always be; And Truth may … - Emily Brontë

"If I were in heaven, Nelly, I should be extremely miserable."
"Because you are not fit to go there," I answered. "All sinners would be miserable in heaven."

"Afraid? No!" he replied. "I have neither a fear, nor a presentiment, nor a hope of death. Why should I? With my hard constitution and temperate mode of living, and unperilous occupations, I ought to, and probably shall, remain above ground till there is scarcely a black hair on my head. And yet I cannot continue in this condition! I have to remind myself to breathe - almost to remind my heart to beat! And it is like bending back a stiff spring: it is by compulsion that I do the slightest act not prompted by one thought; and by compulsion that I notice anything alive or dead, which is not associated with one universal idea. I have a single wish, and my whole being and faculties are yearning to attain it. They have yearned towards it so long, and so unwaveringly, that I'm convinced it will be reached - and soon - because it has devoured my existence: I am swallowed up in the anticipation of its fulfillment. My confessions have not revieved me; but they may account for some otherwise unaccountable phases of humour which I show. Oh God! It is a long fight; I wish it were over!"

I cannot express it; but surely you and everybody 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 foliage 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.