The Art of War by active 6th century B.C. Sunzi

17. When it was to their advantage, they made a forward move; when

otherwise, they stopped still. [Mei Yao-ch’en connects this with the foregoing: "Having succeeded in thus dislocating the enemy, they would push forward in order to secure any advantage to be gained; if there was no advantage to be gained, they would remain where they were."]