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

17. Move not unless you see an advantage; use not your troops unless

there is something to be gained; fight not unless the position is critical. [Sun TzÅ­ may at times appear to be over-cautious, but he never goes so far in that direction as the remarkable passage in the _Tao Te Ching_, ch. 69. "I dare not take the initiative, but prefer to act on the defensive; I dare not advance an inch, but prefer to retreat a foot."]