Haragei was the Rokugani term for trusted instinct. When the belly could perceive things the mind could not. It could tell how to act, even before the threat had appeared. This instinct was trusted by many samurai. 
Sparrow Clan Edit
Haragei was Suzume's philosophy of warriors. To be as the sparrow, to trust one's belly, to allow one's instincts to warn one of danger. It was the first lesson of the Suzume School of Swordmanship, to recognize danger by instinct, to perceive an action before it has occurred, and to act without hesitation.  Literally translated, the term meant "stomach art", and it referred to a exchange of thoughts and feelings that was implied in conversation, rather than explicitly stated.
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