| Quote #1 He [Hindley] has been blaming our father (how dared he?) for treating H. [Heathcliff] too liberally; and swears he will reduce him to his right place.(3.30) |
Hindley started the whole revenge cycle by mistreating Heathcliff in the first place. His envy of Mr. Earnshaw's love for the orphan sets off a chain reaction of abuse and mistreatment.
| Quote #2 So, from the very beginning, he bred bad feeling in the house; and at Mrs. Earnshaw's death, which happened in less than two years after, the young master had learned to regard his father as an oppressor rather than a friend, and Heathcliff as a usurper of his parent's affections and his privileges; and he grew bitter with brooding over these injuries. (5.55) |
Hindley's resentment has a very clear beginning. Before Heathcliff arrives, he is clearly the young man of the house, and he does not easily give up this privilege.
| Quote #3 [. . .] they forgot everything the minute they were together again: at least the minute they had contrived some naughty plan of revenge. (6.11) |
Catherine helped make the misery more bearable for Heathcliff. She is not only his friend and sister, but his co-conspirator in revenge. Clearly Heathcliff was unwilling to sit back and accept poor treatment, even as a child.