related Dizzying Height(s).
Line-3Legge: The third line, dynamic, shows its subject taking no extraordinary precautions against danger, and some in consequence finding opportunity to assail and injure him. There will be evil.
Wilhelm/Baynes: If one is not extremely careful, somebody may come up from behind and strike him. Misfortune.
Blofeld: Unless he takes appropriate precautions, one of his subordinates may slay him -- misfortune!
Liu: If he does not protect himself carefully, someone will stab him in the back. Misfortune.
Ritsema/Karcher: Nowhere Exceeding defending-against it. Adhering, maybe killing it. Pitfall.
Shaughnessy: Not surpassing him but repelling him, following which someone injures him; inauspicious.
Cleary (1): If you do not overcome and forestall it, indulgence will cause harm, which would be unfortunate.
Cleary (2): One does not take precautions in excess, so pursuers attack one. This is unfortunate.
Wu: Ignoring to secure a little excess of protection, he may be fatally wounded. Foreboding.
Line 3 If one is not extremely careful somebody may strike from behind = misfortune. Changes to (16) Enthusiasm. In your enthusiasm to achieve your aim, caution is advised. Self confidence can make you unprepared to meet the challenge presented in what you may dismiss as insignificant. You may need to protect yourself from just blindly following another’s lead. You are warned about the mysterious elements that are in the details should you not attend to them. Enthusiasm can run away with you, but you will be left holding the bag.
Nine in the third place means: If one is not extremely careful somebody may come up from behind and strike him. Misfortune.At certain times extraordinary caution is absolutely necessary. But it is just in such life situations that we find upright and strong personalities who, conscious of being in the right, disdain to hold themselves on guard, because they consider it petty. Instead, they go their way proud and unconcerned. But this self-confidence deludes them. There are dangers lurking for which they are unprepared. Yet such danger is not unavoidable; one can escape it if he understands that the time demands that he pay especial attention to small and insignificant thing.
Changing only this line creates Hexagram 16 - Yu / Enthusiasm. Confidence is good, over confidence not so good. This line would do well to be more careful and respectful of the dangers around him else he be injured by them. Legge sees this line as "...too confident in his own strength, and too defiant of the weak and small enemies that seek his hurt." The resultant hexagram 16, Enthusiasm indicates that this lines confidence may be tempered by intelligent consideration and a good outcome secured.