《资治通鉴·唐纪·唐纪二十七》
这等于是畜养这些胡人让他们充当间谍，时间越久，奸邪狡诈的行为会越多，万一他们窥探到边疆防务的疏漏而有所图谋，必然会带来极大的祸患。
乃是畜养此属使为间谍，日月滋久，奸诈愈深，窥伺边隙，将成大患。
This would be tantamount to keeping these barbarians as spies. The longer this carried on, the more treacherous and cunning their behaviour would become. If they were to spy on any loopholes in the border defences and make any plans, it would inevitably lead to significant disasters.