In Cupid's hand there are arrows of love and hate from King A to King B, and arrows of love and hate from King B to King A, but there are no arrows of love and hate from him to others, and there are no arrows of love and hate from others to him. God asked Cupid to come down to earth to learn how he loves and hates others and how others love and hate him, in order to make four such arrows of love and hate.