21: Shih Ho

This hexagram depicts the mouth in the act of biting through something hard — an obstruction that prevents the jaws from meeting. Thunder above, fire below: the image of swift, illuminating justice that removes what blocks proper order. The situation calls for firm intervention. Something stands between what should be joined, and gentle persuasion has proven insufficient. The obstruction may be a person acting against the common good, a corrupt practice, or simply accumulated debris that clogs the flow of affairs. Success comes through clarity about what must be removed and decisiveness in removing it. This is not vindictive action but corrective — like a surgeon's knife that cuts precisely to heal. The force applied should be proportionate to the resistance encountered, neither excessive nor insufficient.