As a divinatory line, six at the third place of Decrease reads within the hexagram's overall concern with sincerity in one who practices decrease brings great good fortune, freedom from error, firmness and correctness maintained, advantage in every movement, and even in the use of two small dishes for sacrifice. 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 when three men travel together their number is decreased by one, when one man travels alone he finds a friend, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The third line corresponds by classical convention with the sixth line, and the two correspond here, since one line is yin and the other yang. Read together with the trigram it belongs to, Dui in the lower position of the figure, the line marks the hinge between the two trigrams, the last word the lower trigram gets before the upper trigram takes over, 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 third line of Decrease turns Dui into Qian while the other trigram, Gen, stays as it is, which yields Decrease's changing partner, Great Taming (King Wen 26), the hexagram this line is recorded as transforming into.