If Kǎn has appeared in your reading, the book is naming a configuration of genuine difficulty. Water doubled — the trigram of the abyss in both the upper and lower positions. There is no cosmetic reading of this hexagram. The danger is real. The book does not pretend otherwise.

Classical commentary reads this hexagram as the test of the inner anchor. The character 坎 originally meant a pit, and the doubling of it means the pits come one after another. What gets one across is not the cleverness of the route but the steadiness of what one carries inside. 維心 — the heart-anchor — is what the judgment names as the operative principle.

What the book counsels is the patient, repeated exercise of inner trust. The image of water flowing on water is the image of practice itself: the same competence used over and over until the using of it becomes the person. There is no shortcut. There is also, the judgment promises, a real passage — the heart that flows through the pits is honoured by what it accomplishes.

Kǎn's failure mode is the panic that abandons the anchor in the middle of the crossing. The book is alert to it. The hexagram appears when the reader is in a season of repeated difficulty and the temptation is to abandon the inner discipline in favour of some external relief. The relief does not arrive that way. What gets one through is the trust that was there before the trouble started.