EXOD558 The underlying principle here is that a child is obliged to take pains not to distress a parent either physically or emotionally. Rather a child is obliged to try to provide his or her parents with happiness and with joy (Proverbs 15:20): "A wise son makes his father happy; A fool of a man humiliates his mother." According to one commentator, a reason one should not injure one's parents is because, in doing so, one injures oneself. Since one's parents are one's own "flesh and blood," since one's soul is "bound up" with that of one's parents, to cause injury to them is to cause injury to oneself. In this view, harming one's parents is a form of masochism. Moses Hafetz, Malekhet Mahshevet to Leviticus 20:9. A similar motif is also expressed by Abravanel. He wrote, "The benefit [of honoring parents] extends to the child who honors them. As he honors his parent so will he be honored in turn by his own children, for as one treats others so will he be treated by others." Abravanel on Deuteronomy 5:16.