Who gives anything to Poor Tom, whom the foul fiend hath led through fire and through flame, and through ford and whirlipool e’er bog and quagmire; that hath laid knives under his pillow, and halters in his pew; set ratsbane by his porridge; made film proud of heart, to ride on a bay trotting-horse over four-inched bridges, to course his own shadow for a traitor.
– William Shakespeare
King Lear, Act 3, Scene 4. Edgar as the mad Poor Tom babbles about being chased by the "foul fiend" trying to get him to commit suicide by laying knives under his pillow. The "foul fiend" is a reference to his evil half-brother Edmund who tricked and deceived the honest Edgar who was forced to flee after hearing himself declared an outlaw.