The third line of The Marrying Maiden (King Wen 54) is drawn as yin, the numeral six in the old divination manuals. James Legge's translation renders the line as the younger sister in a mean position waiting to be married, returning instead to accept a secondary place. The image sits inside a hexagram whose judgment as a whole concerns action taken now will be evil, in no way advantageous, and this line supplies one stage of that larger reading rather than a complete statement on its own.
Structurally the line stands at the topmost place of the lower trigram Dui, lake in Legge's readings of the eight trigrams, while the upper trigram of the hexagram is Zhen, thunder in the same traditional set of images. The Great Symbolism of the hexagram reads thunder over the waters of a marsh; the superior man, with regard to the far distant end, knows the mischief that may be done at the beginning, and the third line takes its place inside that combined picture of Dui below and Zhen above.
Read on its own the line neither opens nor closes the hexagram's argument. It marks the point where Dui is either forming (in the lower trigram) or completing itself (in the upper), and later interpreters treat its image, Waiting in a Mean Position to Be Married, as the concrete case through which the hexagram's abstract judgment becomes visible in a single situation rather than a general principle.