《旧唐书·本纪·卷十八》
制命说： 逆贼郭谊等人，本是狐鼠之类的妖孽，依靠山丘和洞穴作为牢固的据点；只有牛羊一般的力量，得了水草却变得格外凶狠。
制曰： 逆贼郭谊等，狐鼠之妖，依丘穴而作固；牛羊之力，得水草而逾凶。
The Imperial Edict reads: The rebellious bandits such as Guo Yi, were originally demons like foxes and rats, relying on hills and caves as their solid strongholds; they only had the strength of cattle and sheep, but they became extremely ferocious after getting water and grass.