《资治通鉴·唐纪·唐纪三十二》
从唐朝建立以来，边防将帅用的都是忠厚名臣，不让久任，不让在朝中遥领，不让同时任数职，功名显著的常常入朝为宰相。
自唐兴以来，边帅皆用忠厚名臣，不久任，不遥领，不兼统，功名著者往往入为宰相。
Since the founding of the Tang Dynasty, loyal and famous ministers were always used as border generals. They were not allowed to have long terms in office, to hold office remotely from the capital, or to hold several offices concurrently. Those who made significant contributions usually went to serve as prime ministers at the capital.