《管子·匡君大匡》
欺诈如行得机密而后动兵，是可以打胜敌人的；但对民行诈就不能取得人民信任。
夫诈密而后动者胜，诈则不信于民。
If he can use deceit in a secretive and calculated way, and then launch an attack, he might be able to defeat the enemy. But if he uses deceit on his own people, he will not be able to gain their trust.