Remember the angel, what he say to the boy. Hold to it, now; there is your rock.
– Arthur Miller
The Crucible, Act 3. John Proctor uses the metaphor of a rock to advise Mary Warren to be strong. He asks her to remember that archangel Raphael advised Tobit and his son Tobias to "Do that which is good, and no harm will come to thee." He is alluding to the story from the Book of Tobit, one of the books of the Apocrypha. It tells of how Tobias fell in love with Sarah, a woman plagued by a demon that killed each of her seven previous husbands. With the help of Raphael the demon is exorcised and Tobias and Sarah marry.