As a divinatory line, nine at the sixth 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. Its own text, that confidence shown in drinking wine, no error, but if the head is wetted in doing so, even sincerity in the matter goes wrong, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The sixth line corresponds by classical convention with the third line, and the two correspond here, since one line is yin and the other yang. Read together with the trigram it belongs to, Li in the upper position of the figure, the line marks the far edge of the hexagram, past the point the ruling fifth line governs, 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 sixth line of Before Completion turns Li into Zhen while the other trigram, Kan, stays as it is, which yields Before Completion's changing partner, Deliverance (King Wen 40), the hexagram this line is recorded as transforming into.