The strategists have a saying: “I dare not be host, but would rather be guest; I advance not an inch, but instead retreat a foot.” This is called Marching without ranks, Bearing nonexistent arms, Flourishing nonexistent weapons, Driving back nonexistent enemies. There is no greater misfortune than not having a worthy foe; Once I believe there are no worthy foes, I have well-nigh forfeited my treasures. Therefore, When opposing forces are evenly matched, The one who is saddened will be victorious.