《资治通鉴·汉纪·汉纪五十八》
现在，曹操在北方，疆场并没有平静；刘备寄居在荆州，好像是在家里养了一只老虎。
方今曹操在北，疆场未静；刘备寄寓，有似养虎。
Presently, Cao Cao is in the north, and the battlefield is not peaceful. Liu Bei takes refuge in Jingzhou, which seems to be nesting a tiger at home.