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When torrential water tosses boulders, it is because of its momentum. When the strike of a hawk breaks the body of its prey, it is because of timing.

Sun-tzu, Gerald A. Michaelson (2001). “Sun Tzu: The Art of War for Managers; 50 Strategic Rules”, p.91, Adams Media
When torrential water tosses boulders, it is because of its momentum. When the strike of a hawk breaks the body of its prey, it is because of timing.