《资治通鉴·汉纪·汉纪六十》
诸葛亮问从事、犍为人杨洪应如何处理此事，杨洪说： 汉中是益州的咽喉，存亡的关键，如失去汉中，就没有蜀了，这是家门前的祸患，对发兵有什么疑问！ 
诸葛亮以问从事犍为杨洪，洪曰： 汉中，益州咽喉，存亡之机会，若无汉中，则无蜀矣。此家门之祸也，发兵何疑！ 
Zhuge Liang asked the office worker and native of Qianshan, Yang Hong, for his opinion on the matter. Yang Hong said: The Han River Basin is the vital point in Yizhou, and the key to its survival. If the Han River Basin is lost, there would be no Shu. This is a threat to our doorstep, so why would there be any doubt about the mobilisation of troops?