If Zhōng Fú has appeared in your reading, the book is naming the configuration of inner truth — the deep centre fully aligned with itself, communicating outward without strain. The two yin lines in the middle of the hexagram are surrounded by yang lines on both sides; the centre is hollow, receptive, ready to be filled by what is actually there. The image is wind moving over a lake — surface and depth both responsive.

Classical commentary reads this hexagram as one of the book's most powerful configurations. The famous opening image of the judgment — 豚魚吉, pigs and fishes auspicious — refers to creatures classically considered incapable of being moved by reason or appeal. The book is making a precise claim: when the inner truth is genuine, even what cannot be reasoned with is reached. Sincerity at this depth crosses thresholds that argument cannot.

What the book counsels is the careful tending of the centre. The image's instruction — discuss litigation, delay the death penalty — is exact about the kind of attention this hexagram requires. Where serious matters are at stake, the work is to bring the inner truth into the procedure, not to let the procedure substitute for it. The reader is being asked to slow down in proportion to what hangs on the decision.

Zhōng Fú's failure mode is the performance of sincerity that is not actually felt. The book is unsparing about this. The hexagram appears when the reader has, or could have, access to the deep alignment that this configuration names — and the temptation is to mimic its effects without doing its inner work. The clearance is for the real thing. The pigs and fishes can tell the difference.