"Hera returned to Olympus, well pleased with the punishment she had made for echo, leaving the poor nymph to weep sadly amount the rocks on the mountainside and speak the words which her sisters and their friends shouted happily to one another." This connects because it they are treating Echo badly in a way that they probably wouldn't want to be treated.
"Narcissus flung the beautiful nymph away from him in scorn." This connects because he flings the nymph off of him and hurts Echo. If this was him he would feel very hurt.
" Poor Narcissus did not know that he was seeing his own reflection, for Aphrodite hid his knowledge from him." If it was Aphrodite that was in his position he would want him to tell her that if was just his refection in the pond.