“The opportunity of defeating the enemy is provided by the enemy himself.”

You cannot manufacture the win alone; it appears when the opponent errs, so be ready to receive it.
Chapter 4 pairs its first command with its corollary: secure yourself, then wait — because the opportunity of defeating the enemy is provided by the enemy himself. The verse quietly reassigns agency. Victories are not manufactured by genius alone; they are received, and only by those already standing in position when the error arrives. Patience, in this design, is not passive — it is readiness under discipline.
A systems integrator spends two slow years becoming the only vendor certified on a niche platform everybody considered too small to matter. Then the platform’s maker stumbles into a compliance crisis, and every major customer must migrate within months. The integrator that had "wasted" those years takes on forty accounts in a quarter. It created nothing; it collected a mistake at scale, because it was the only one standing there.
Waiting for the enemy’s error is not a substitute for your own excellence — the integrator’s certification was hard, deliberate work. Nor does the verse license vulture ethics: exploiting a blunder means serving the need the blunder created, not kicking the fallen. The misreading is treating patience as the strategy; it is only the delivery schedule.