In 'Echo', the quote "Too sweet, too bitter sweet, Whose wakening should have been in Paradise... Where thirsting longing eyes, Watch the slow door", the use of Paradox ("Too sweet, too bitter sweet") reflects the contrast between the dream world, where the beloved appears, and the waking world, where absence prevails - The dream is “too sweet” in its vividness, but “too bitter sweet” in the inevitable return to loss upon waking - Rossetti uses this to emphasize the cruel transience of dreams and the permanence of reality