The third line of Increase (King Wen 42) is drawn as yin, the numeral six in the old divination manuals. James Legge's translation renders the line as increase given by means of what is in itself evil, so that there is no error if he holds to sincerity and walks in the middle course, reporting even with the symbol of his rank. The image sits inside a hexagram whose judgment as a whole concerns advantage in every movement undertaken, even advantage in crossing the great stream, and this line supplies one stage of that larger reading rather than a complete statement on its own.
Structurally the line stands at the topmost place of the lower trigram Zhen, thunder in Legge's readings of the eight trigrams, while the upper trigram of the hexagram is Xun, wind in the same traditional set of images. The Great Symbolism of the hexagram reads wind and thunder together; the superior man, seeing what is good, moves toward it, and seeing his errors, turns away from them, and the third line takes its place inside that combined picture of Zhen below and Xun above.
Read on its own the line neither opens nor closes the hexagram's argument. It marks the point where Zhen is either forming (in the lower trigram) or completing itself (in the upper), and later interpreters treat its image, Increase Given by Means of What is Evil, as the concrete case through which the hexagram's abstract judgment becomes visible in a single situation rather than a general principle.