Read it through once

He seemed a sullen, patient child; hardened, perhaps, to ill-treatment: he would stand Hindley’s blows without winking or shedding a tear, and my pinches moved him only to draw in a breath and open his eyes, as if he had hurt himself by accident, and nobody was to blame. This endurance made old Earnshaw furious, when he discovered his son persecuting the poor fatherless child, as he called him. He took to Heathcliff strangely, believing all he said (for that matter, he said precious little, and generally the truth), and petting him up far above Cathy, who was too mischievous and wayward for a favourite.