《管子·霸言》
应该避开实力而击其空虚，避开坚固而击其脆弱，避开难攻之地而击其易被摧毁的地方。
释实而攻虚，释坚而攻膬，释难而攻易。
We should avoid their strengths and attack their weaknesses, avoid their strengths and attack their weaknesses, and avoid places that are difficult to attack and attack places that are easy to destroy.