Put out the light, and then put out the light:
If I quench thee, thou flaming minister,
I can again thy former light restore
Should I repent me; but once put out thy light,
Thou cunning'st pattern of excelling nature,
I know not where is that Promethean heat
That can thy light relume.
-- William Shakespeare (1564-1616), Othello
-- Act v, Sc. 2