"That is nothing to the purpose," said Heathcliff. (He it was.) "I don't hate my son, I suppose; and it is concerning him that I demand your attention. Yes; you have cause to blush. Two or three months since, were you not in the habit of writing to Linton? making love in play, eh? You deserved, both of you, flogging for that! You especially, the elder; and less sensitive, as it turns out. I've got your letters, and if you give me any pertness I'll send them to your father. I presume you grew weary of the amusement and dropped it, didn't you? 
'That is nothing to the purpose,' said Heathcliff. 'I don't hate my son, I suppose; and it is about him that I want to speak. Yes; you have cause to blush. Two or three months ago, were you not in the habit of writing to Linton? making love in play, eh? You both deserved flogging for that! You especially, the elder; and less sensitive, as it turns out. I've got your letters, and if you give me any pertness I'll send them to your father. I presume you grew weary of the amusement and dropped it? 