The fourth line crosses into the upper trigram, Qian, pure firmness, and the dispute reaches a genuine turning point: unable to win it, the line counsels returning to one's proper duty and accepting the outcome, but specifically with a changed mind, and this brings peace and firmness rather than mere resignation. The distinction between this line and the second, which also cannot win its contest, is the quality of the change involved. Line two withdraws tactically while its underlying position is unchanged; line four is described as actually altering its resolve, a real reconsideration rather than a retreat under pressure. That inward change is what the line credits with the peace it describes, suggesting that the hexagram distinguishes sharply between giving up a fight because one has been overpowered and giving it up because one has genuinely reconsidered its worth.
Positioned at the base of the trigram of pure strength, this line shows that even considerable capacity for contention can be set down voluntarily, and that doing so, rather than being forced to it, is what produces lasting firmness instead of simple defeat. The hexagram treats this kind of reconsideration as rarer, and more valuable, than either the outright victory of line five or the outright retreat of line two, since it requires acknowledging error without any external force compelling the admission.