Biff does not want to lead his wife. He said that he felt like a hypocrite trying to lead his wife while sporadically sinning against her. Biff asked, “How can I lead her and sin against her at the same time?” Admittedly, Mable does not make it any easier on Biff as she reminds him of his sin when he tries to lead her. Biff took the position that it is better not to lead Mable at all if he’s going to sin against her.