大壮卦九四
雷天大壮 · 周易第 34 卦
九四：贞吉悔亡，藩决不羸，壮于大舆之輹。
小象传
象曰：藩决不羸，尚往也。
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），六亲为父母，持世。
此爻变
此爻独动，雷天大壮变为地天泰（第 11 卦）。对应的易林诗：焦氏易林·大壮之泰。
理雅各英译（1882）
The fourth NINE, undivided, shows (a case in which) firm correctness leads to good fortune, and occasion for repentance disappears. (We see) the fence opened without the horns being entangled. The strength is like that in the wheel-spokes of a large waggon.
'The fence is opened and the horns are not entangled:' - (the subject of the line) still advances.
本卦
雷天大壮（第 34 卦），卦辞：大壮：利贞。
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。