As a divinatory line, nine at the sixth place of The Cauldron reads within the hexagram's overall concern with great progress and success. 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 caldron with rings of jade, great good fortune, and every movement advantageous, 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 do not correspond here, since both lines share the same character. 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 The Cauldron turns Li into Zhen while the other trigram, Xun, stays as it is, which yields The Cauldron's changing partner, Duration (King Wen 32), the hexagram this line is recorded as transforming into.