Read it through once

“You are a boastful champion,” replied Heathcliff; “but I don’t like you well enough to hurt him: you shall get the full benefit of the torment, as long as it lasts. It is not I who will make him hateful to you—it is his own sweet spirit. He’s as bitter as gall at your desertion and its consequences: don’t expect thanks for this noble devotion. I heard him draw a pleasant picture to Zillah of what he would do if he were as strong as I: the inclination is there, and his very weakness will sharpen his wits to find a substitute for strength.”