《旧唐书·列传·卷二十一》
假如让西域的人以商人的身份来往，边地人民就会因此得利；如果作为宾客前来。国中就会消耗大量资财而深受其害。
若任其商贾来往，边人则获其利；若为宾客，中国即受其弊矣。
If the people of Central Asia are allowed to come and go as merchants, the people on the border will benefit from it; if they come as guests, the country will consume a lot of money and suffer from it.