已日乃孚，元亨利贞。
泽中有火，革；君子以治历明时。
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革卦象征「变革、更新、除旧布新」。卦辞「己日乃孚，元亨利贞，悔亡」——变革不可仓促，要到了「日子到了」（己日）人们才会信；变得对，悔自然消。…
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革，水火相息，二女同居，其志不相得，曰革。已日乃孚，革而信之。文明以说，大亨以正，革而当，其悔乃亡。天地革而四时成，汤武革命，顺乎天而应乎人，革之时大矣哉！
上六：君子豹变，小人革面。征凶，居贞吉。
君子豹变，其文蔚也。小人革面，顺以从君也。
九五：大人虎变，未占有孚。
大人虎变，其文炳也。
九四：悔亡，有孚改命，吉。
改命之吉，信志也。
九三：征凶，贞厉。革言三就，有孚。
革言三就，又何之矣。
六二：己日乃革之，征吉，无咎。
己日革之，行有嘉也。
初九：巩用黄牛之革。
巩用黄牛，不可以有为也。
「革」者，改变之名也。
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View original source夫民可与习常，难与适变；可与乐成，难与虑始。故革之为道，即日不孚，已日乃孚也。
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View original source革者，变其故也。变其故则人未能遽信，故必已日然后人心信从。
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