혁(革) — 연못 위에 불. 물과 불이 싸워 변혁이 필요하다. 변혁에는 시기와 성실이 필요하다. 때가 되면 대담하게 바꾸라.
효별 해설
초효：巩用黄牛之革。 Bound with yellow ox-hide. At the start of revolution, hold steady; do not rush.
이효：巳日乃革之，征吉，无咎。 Only on the si day make the change — going brings good fortune; no harm. Wait for the right moment.
삼효：征凶，贞厉。革言三就，有孚。 Campaigning is dangerous — uprightness carries risk. The call for change is accepted only after three times; have sincerity. Communicate repeatedly.
사효：悔亡。有孚改命，吉。 Regret vanishes — with sincerity, change the mandate; auspicious. Firm conviction brings successful revolution.
오효：悔亡。有孚改命，吉。 The great one changes like a tiger — without divination, there is trust. Push change with powerful resolve.
상효：君子豹变，小人革面。征凶，居贞吉。 The noble changes like a leopard; the small change their faces. Campaigning is dangerous; staying upright brings good fortune. Revolution transforms everyone.