As a divinatory line, nine at the second place of Before Completion reads within the hexagram's overall concern with progress and success, like a young fox that has almost crossed the stream when its tail gets wet, so there is no advantage in any direction yet. The line occupies a place that does not match its own nature in the classical doctrine that odd places favour a firm, yang line and even places favour a yielding, yin line. It is also one of the two central lines of the hexagram, the place classical reading treats as the most balanced regardless of the line's own character. Its own text, that dragging back the wheels of his carriage, firm correctness brings good fortune, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The second line corresponds by classical convention with the fifth line, and the two correspond here, since one line is yin and the other yang. Read together with the trigram it belongs to, Kan in the lower position of the figure, the line marks the situation settling into its own character, still wholly inside the lower trigram, one stage in the six stage movement the hexagram traces from its first line to its last.
A change at this line, from yang to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the second line of Before Completion turns Kan into Kun while the other trigram, Li, stays as it is, which yields Before Completion's changing partner, Progress (King Wen 35), the hexagram this line is recorded as transforming into.