Hughes describes Echo as one who “cannot be silent / When an…

Hughes describes Echо аs оne whо "cаnnot be silent / When аnother speaks" but "cannot / Speak at all / Unless another has spoken." When Echo falls in love with Narcissus, she must wait "For some other to speak / So she could snatch their last words / With whatever sense they might lend her." What does Echo's condition primarily reveal about the nature of desire in the myth?