《三国志·吴书·周瑜鲁肃吕蒙传》
之前，益州牧刘璋纲纪法度废弛，周瑜、甘宁都劝说孙权谋取蜀地。孙权用这件事咨询刘备，刘备心中在替自己谋划，表面上仍假意回答说： 我刘备与刘璋托名为皇室宗族，希望依凭先人英灵，以匡扶汉室。
先是，益州牧刘璋纲维颓弛，周瑜、甘宁并劝权取蜀，权以咨备，备内欲自规，乃伪报曰： 备与璋讬为宗室，冀凭英灵，以匡汉朝。
Previously, the Governor of Yizhou, Liu Zhang, neglected discipline and the rule of law, and Zhou Yu and Gan Ning both persuaded Sun Quan to seize Shu. Sun Quan consulted Liu Bei on the matter, but Liu Bei calculated in his own interests and pretended to respond by saying: “I, Liu Bei, and Liu Zhang are both titled as descendants of the imperial clan, and I hope to rely on the spirits of our ancestors to support the Han Dynasty.