As a divinatory line, nine at the fourth place of The Wanderer reads within the hexagram's overall concern with some small attainment and progress for the stranger who is firm and correct as he travels. 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 the wanderer finding a resting place and the means to travel, yet his heart is not at ease, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The fourth line corresponds by classical convention with the first 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 first word of the upper trigram, close enough to the ruling fifth line to be shaped by it, 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 fourth line of The Wanderer turns Li into Gen while the other trigram, Gen, stays as it is, which yields The Wanderer's changing partner, Keeping Still (King Wen 52), the hexagram this line is recorded as transforming into.