《资治通鉴·汉纪·汉纪三十八》
先前，我曾率领部下三十六人出使绝远的异域，备受艰难困苦，自从孤守疏勒，到如今已有五年。对于异族的情况，我颇有了解。无论询问西域的大国小国，全都一致回答：依赖汉朝，等于依赖上天。
臣前与官属三十六人奉使绝域，备遭艰厄，自孤守疏勒，于今五载，胡夷情数，臣颇识之，问其城郭小大，皆言倚汉与依天等。
Previously, I led my subordinates of thirty-six people on a mission to a very distant foreign land and endured great hardships. Since I have been guarding Shule alone, five years have passed. I know quite a lot about the situation of foreign peoples. Whenever I ask the large and small countries of the Western Regions about their views, they all answer consistently: "Relying on the Han Dynasty is like relying on Heaven itself."