O serpent heart, hid with a flowering face!
Did ever dragon keep so fair a cave?
Beautiful tyrant! fiend angelical!
Dove-feather’d raven! wolvish-ravening lamb!
Despised substance of divinest show!
Just opposite to what thou justly seem’st,
A damned saint, an honourable villain!

– William Shakespeare

Romeo and Juliet, Act 3, Scene 2. A confused Juliet’s heart turns against Romeo after hearing from the Nurse that he has been banished for killing Tybalt – "Tybalt is gone, and Romeo banished; Romeo that kill’d him, he is banished." In a metaphor, Juliet laments that Romeo’s beautiful "flowering face" could conceal such a "serpent heart." She follows up with more vivid metaphors and oxymorons, to express her shock that Romeo could appear so saintly and yet be such a villain. She uses wonderful imagery depicting the contradictory nature of human behavior, how a beautiful appearance can conceal the monster inside.