If Pǐ has appeared in your reading, the book is naming the condition opposite to Tài — and naming it without softening. Heaven is above, earth is below, each in its natural place, and precisely because each is in its natural place they do not touch. The trigrams have nowhere to meet.
Classical Chinese cosmology is exact about this. Heaven rises; earth settles; when both move in their accustomed directions, the distance between them grows. This is the season the farmer does not plant. The conversation that does not resume. The hour the message does not arrive.
What the book counsels is not action but withdrawal — 儉德辟難, withdraw into virtue and avoid difficulty. Not exile, not despair: the deliberate movement of the work to the inside, where it can continue while the outside remains closed. Honours and titles offered in this season are traps; refuse them.
Pǐ is paired with Tài in the King Wen sequence the way day is paired with night. Neither hexagram is final. The book is naming a phase, not a fate. The discipline of Pǐ is the discipline of staying intact through it, so that when the channels open again the inner work has not been wasted.