《魏书·列传·卷四十三》
而且蜀地险隘，自古有此说法，镇戍安泰，更无他图，我们哪能凭着传闻，便动用大军。
且蜀地险隘，称之自古，镇戍晏然，更无异趣，岂得虚承浮说，而动大军。
In addition, the Sichuan area is dangerous and narrow. Since ancient times, there is a saying that the town is safe and stable, and there is no other plan. How can we use our army just based on rumors?