Heathcliff, determined to see Catherine, vows not to leave her to Edgar"s "duty and humanity". His scorn at these words reflects the opposing temperaments of the inhabitants of the two houses, Wuthering Heights and Thrushcross Grange. The former is an untamed world of deep passions and visceral emotions, while the cultivated Thrushcross Grange temperament is characteristically languid and conventional. Nelly is of neither a Wuthering Heights nor a Thrushcross Grange temperament. Her normality in comparison to the other characters provides us with the perspective of an ordinary person on the ensuing conflict between the two sensibilities. She is adamant in...
or Catherine"s love. Heathcliff cannot see how Catherine can "love in him what he has not". To Heathcliff, there is no question as to where Catherine belongs. He regards Cathy as entirely of a Wuthering Heights personality, with "a heart as deep as [he has]".

Indeed, later in the novel Heathcliff equates living without Catherine with living "with [his] soul in the grave". He tells her that "in breaking [her heart, she] has broken [his]". These comments show the extent to which Heathcliff and Catherine are of the same temperament, and truly belong to the world of Wuthering Heights.