Do Nothing Which Is of No Use

Do Nothing Which Is of No Use is the ninth and concluding principle in a set of broad precepts for studying strategy. It condenses the book’s practical ethic: action should belong to a Way learned deeply enough to guide perception, movement, and judgment, not to habit or empty imitation.

The Principle in the Set

The maxim follows two instructions to perceive what cannot be seen and to attend even to trifles. Its position makes usefulness a matter of disciplined attention as well as economy: the strategist must notice what matters, including what is easily overlooked, and avoid conduct that serves no purpose. The book urges the reader to set these principles in the heart and train in strategy, connecting their study to the capacity to prevail in combat and to act effectively on a larger scale.

That larger scale is essential to the maxim’s scope. The book says that a strategist should be able to manage subordinates, govern a country, and preserve a ruler’s discipline. In this framing, usefulness is not simply a test for individual techniques; the Way is presented as a means of effective action extending from personal combat to leadership and public order.

Reading Must Become Practice

The book explicitly warns that reading alone does not bring mastery. Its instructions are to absorb what is written rather than merely read, memorize, or imitate it, and to make the principles part of the body through sustained study. The maxim therefore does not license a shallow rejection of effort: it calls for distinguishing useful practice from activity that does not advance understanding or skill.

The teaching’s emphasis on bodily learning is concrete. The student is told to adopt a composed, upright stance, keep the body aligned, and secure the Companion sword at the abdomen. The same combat stance should be maintained in everyday life. The connection between ordinary posture and fighting posture shows how the Way makes training continuous: useful knowledge is cultivated in the body before a particular encounter demands it.

Judgment Made Physical

The book likewise treats perception as a trained capacity. The gaze should be broad, able to take in distant and nearby matters in relation to one another, and should not be distracted by insignificant movements. Such attention gives the maxim a specific strategic implication: usefulness depends on judging the whole situation, not reacting indiscriminately to every detail.

Instructions for handling and moving the Long sword carry the same principle into technique. The grip should be firm in the last two fingers but not fixed, because a pliable hand is living while a fixed one is dead. The feet should move as in ordinary walking, with neither foot preferred; the prescribed Yin-Yang foot alternates left and right through cutting, retreating, and warding. These details contrast purposeful adaptability with rigid habits that impede action.

The principle also governs direct engagement. In the Body Strike, the practitioner closes through a gap in the enemy’s guard, turns the face slightly aside, and drives the left shoulder into the enemy’s breast in time with the breath. In Glue and Lacquer Emulsion Body, the practitioner sticks closely with head, body, and legs so that no gap opens between the two bodies. These methods make usefulness situational and embodied: the point is not to accumulate motions, but to apply the appropriate action at the opening the encounter provides.

A Way Tested in Action

The book describes an instant timing in which the practitioner strikes as soon as the enemy remains undecided, without first settling the spirit or moving the body unnecessarily. It insists that this timing must be trained until the strike can occur in an instant. The maxim thus culminates not in inactivity but in readiness: practice removes needless hesitation so that action can meet the moment directly.

The instructions for transmission reinforce this distinction between words and competence. The oral tradition is stated as “Teach your body strategy.” The student is told to learn the five approaches and five attitudes, understand spirit and timing, and bring sword, body, legs, and spirit into natural harmony. Study proceeds one item at a time, tested through fighting, with patient practice and repeated encounters; merely killing an enemy without acting from what has been learned is not the true Way.

The book’s closing account of the Void returns to the danger of mistaking ignorance for understanding. What cannot yet be understood is not thereby the Void; it may be bewilderment. The practitioner must study other martial arts without departing from the warrior’s Way, accumulate practice day by day and hour by hour, and clear the mind of confusion. Read in this conclusion, Do Nothing Which Is of No Use is a demand for disciplined discrimination: cut away what does not serve the Way, but do not confuse what remains unmastered with what is genuinely understood.