丰卦九四
雷火丰 · 周易第 55 卦
九四：丰其蔀，日中见斗，遇其夷主，吉。
小象传
象曰：丰其蔀，位不当也。日中见斗，幽不明也。遇其夷主，吉；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，同为阳爻为无应。
京房纳甲：庚午（火），六亲为妻财。
此爻变
此爻独动，雷火丰变为地火明夷（第 36 卦）。对应的易林诗：焦氏易林·丰之明夷。
理雅各英译（1882）
T he fourth NINE, undivided, shows its subject in a tent so large and thick that at midday he can see from it the constellation of the Bushel. But he meets with the subject of the (first) line, undivided like himself. There will be good fortune.
'He is surrounded by a screen large and thick:' - the position of the line is inappropriate. 'At midday he sees the constellation of the Bushel:' - there is darkness and no light. 'He meets with the subject of the line, undivided like himself. There will be good fortune:' - action may be taken.
本卦
雷火丰（第 55 卦），卦辞：丰：亨，王假之，勿忧，宜日中。
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。