The second line of Breakthrough (King Wen 43) is drawn as yang, the numeral nine in the old divination manuals. James Legge's translation renders the line as full of apprehension and calling out, hostile measures may come by night but there is no cause for anxiety. The image sits inside a hexagram whose judgment as a whole concerns the culprit's guilt exhibited at the royal court, with sincere and earnest appeal, and a consciousness of the peril in cutting the criminal off, and this line supplies one stage of that larger reading rather than a complete statement on its own.
Structurally the line stands at the middle place of the lower trigram Qian, heaven in Legge's readings of the eight trigrams, while the upper trigram of the hexagram is Dui, lake in the same traditional set of images. The Great Symbolism of the hexagram reads the waters of a marsh mounted above heaven; the superior man bestows his gifts on those below rather than letting them accumulate unused, and the second line takes its place inside that combined picture of Qian below and Dui above.
Read on its own the line neither opens nor closes the hexagram's argument. It marks the point where Qian is either forming (in the lower trigram) or completing itself (in the upper), and later interpreters treat its image, Full of Apprehension and Calling Out, as the concrete case through which the hexagram's abstract judgment becomes visible in a single situation rather than a general principle.