《资治通鉴·汉纪·汉纪三十八》
讨伐匈奴、屯驻西域，都是先帝的决策，不应有所变化。 
征伐匈奴，屯戍西域，先帝所建，不宜回异。 
Sending expeditions against the Xiongnu and stationing troops in the Western Regions were both decisions made by the late emperor and should not be changed.