未济卦九四
火水未济 · 周易第 64 卦
九四：贞吉，悔亡，震用伐鬼方，三年有赏于大国。
小象传
象曰：贞吉悔亡，志行也。
爻位
九四是阳爻居四位，阳居阴位为不当位；与初爻相应，一阴一阳为有应。
京房纳甲：己酉（金），六亲为妻财。
此爻变
此爻独动，火水未济变为山水蒙（第 4 卦）。对应的易林诗：焦氏易林·未济之蒙。
理雅各英译（1882）
The fourth NINE, undivided, shows its subject by firm correctness obtaining good fortune, so that all occasion for repentance disappears. Let him stir himself up, as if he were invading the Demon region, where for three years rewards will come to him (and his troops) from the great kingdom.
(By firm correctness there is good fortune, and cause for repentance disappears:' - the aim (of the subject of the line) is carried into effect.
本卦
火水未济（第 64 卦），卦辞：未济：亨，小狐汔济，濡其尾，无攸利。
经文依通行本，已与 Chinese Text Project（ctext.org）逐段比对。卦象是研读与自我反思的材料，不作吉凶断语，也不替代医疗、法律、财务等专业意见。