"Prohibit the taking of omens, and do away with superstitious doubts. Then, until death itself comes, no calamity need be feared."

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On the field of battle, the spoken word does not carry far enough; hence the institution of gongs and drums... banners and flags. Gongs and drums, banners and flags, are means whereby the ears and eyes of the host may be focused on one particular point.

— Sun Tzu