As a divinatory line, nine at the first place of Revolution reads within the hexagram's overall concern with believed in only once it is accomplished, great progress and success, advantage in being firm and correct, so that any occasion for repentance disappears. The line occupies a place proper to 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 bound as if with the skin of a yellow ox, not yet the moment to act, 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, Li 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 yang to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the first line of Revolution turns Li into Gen while the other trigram, Dui, stays as it is, which yields Revolution's changing partner, Influence (King Wen 31), the hexagram this line is recorded as transforming into.