《三略·上略》
将帅谋划秘密，奸细便无机可乘。士卒意志统一，军心便团结不离。攻击行动迅速，敌军便不及防备。
将谋密，则奸心闭；士众一，则军心结；攻敌疾，则备不及设。
When a commanding general keeps his plans secret, spies will have no chance to exploit them. When his soldiers are unified in resolve, the morale of the army will remain strong and united. When his attacks are swift, the enemy will be unable to prepare for them.