The Art of War by active 6th century B.C. Sunzi

19. Let your plans be dark and impenetrable as night, and when you

move, fall like a thunderbolt. [Tu Yu quotes a saying of T’ai Kung which has passed into a proverb: "You cannot shut your ears to the thunder or your eyes to the lighting—so rapid are they." Likewise, an attack should be made so quickly that it cannot be parried.]