Nine in the fifth place is drawn when a querent holds a position others take their bearings from, and the question concerns their own conduct in it. The text credits a superior man contemplating the course of his own life with falling into no error, and the commentary specifies how the contemplation is done: by looking at the ways of the people. The evidence is external even though the object of study is oneself.
That is the practical core of the line and it resists the usual comfortable reading. A querent cannot satisfy this line by examining their motives, because the standard offered is the state of those under their influence. Where a team, a family, a congregation or a readership shows the effects of how the querent has actually behaved, the line asks that those effects be read as the verdict.
Strong and correctly placed in the fifth position, central in the upper trigram Xun, this is the only structurally sound line in the hexagram and the one every other looks toward. Its favourable reading is not automatic. Freedom from error is credited to the superior man specifically, which makes the line a description of a standard being met rather than a promise that it will be. The querent is being handed a measure to apply, not a verdict already reached, and the measure is one other people can see the results of.