Three Days Before and Three Days After

Three Days Before and Three Days After is a maxim of preparation and review for consequential change in the I Ching. It places deliberation on both sides of action: give notice before making a change, then reconsider it afterward. The rule appears in two different contexts, where it connects a potentially difficult transition with success grounded in care and correctness.

The Rule in Kû

The judgment for Kû describes progress for someone who deals properly with the condition represented by the hexagram, and says that crossing the great stream may be advantageous. It immediately qualifies this prospect with a temporal instruction: weigh the events of three days before the turning point and those to be undertaken three days after it. Change is thus treated not as a single decisive instant but as a transition requiring attention on either side.

The instruction does not specify what the three days contain. Its emphasis, as the commentary presents it, is on considering the circumstances around the turning point before proceeding. The possibility of progress and the crossing of the great stream remain conditional on handling the situation properly.

Notice and Reconsideration in Sun

A related formulation appears in the fifth line of Sun. There, firm correctness is associated with good fortune: occasions for repentance disappear, movements become advantageous, and an unsatisfactory beginning may still lead to a good end. The three-day rule gives this prospect a practical shape. Notice is to be given three days before changes are made; three days afterward, those changes are to be reconsidered.

The sequence distinguishes advance notice from retrospective review. Together, they make change deliberate rather than abrupt: those affected can be informed beforehand, while the period afterward permits the decision to be examined again. The line presents this practice within a broader statement about the course from a poor beginning to a good ending, rather than as a promise that change itself guarantees success.

Meaning and Limits

Across the two passages, the maxim gives time a governing role in change. Kû directs attention to the days before and after a turning point; Sun makes the two phases more explicit as notice and reconsideration. In both, favorable results depend on how the condition is handled, not merely on the passage of three days.

The wording therefore supports a principle of measured action and review, but does not set out a general timetable for every decision or explain the precise procedures of notice and reconsideration. Its significance lies in making preparation and subsequent reassessment part of the work of change itself.