As a divinatory line, six at the first place of Development reads within the hexagram's overall concern with the marriage of a young lady, and the good fortune attending it, advantage in being firm and correct. 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 wild geese gradually approaching the shore, a young officer in danger and spoken against, yet no error, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The first line corresponds by classical convention with the fourth line, and the two do not correspond here, since both lines share the same character. Read together with the trigram it belongs to, Gen in the lower position of the figure, the line marks the opening of the situation, before the trigram above it has any part in the reading, one stage in the six stage movement the hexagram traces from its first line to its last.
A change at this line, from yin to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the first line of Development turns Gen into Li while the other trigram, Xun, stays as it is, which yields Development's changing partner, The Family (King Wen 37), the hexagram this line is recorded as transforming into.