DESDEMONA: No, by this heavenly light!
EMILIA: Nor I neither by this heavenly light; I might do ‘t as well i’ the dark.
– William Shakespeare
Othello, Act 4, Scene 3. The virtuous Desdemona declares "by this heavenly light" that she would not for all the world cheat on her husband. But Emilia has an altogether different view on adultery, joking that she might do it in the dark.