Fire in the lake: Revolution. Superior people set the calendar in order & make the seasons clear.
革： 巳日乃孚， 元亨利貞，悔亡。
Revolution: On your own day you are believed. Great success, furthered through perseverance. Remorse disappears.
君子豹變， 小人革面， 征凶， 居貞吉。
Superior people transform like a leopard. Inferior people change on the surface. Advancing leads to misfortune. Remaining & persisting leads to good fortune.
Great people change like a tiger. Even before questioning, they are believed.
Regret disappears. There is trust. Changing the rules brings good fortune.
Starting brings misfortune. Perseverance brings danger. When talk of revolution has gone around three times, one may commit: people will believe them.
When the right day for revolution arrives, start. Good fortune. No blame.
For strength, use yellow oxhide.