《旧唐书·列传·卷三十》
现在一旦抛弃金城汤池一样坚固的安全，远渡辽海之外，臣忽然三思，烦虑愁绪交集。
今一旦弃金汤之全，渡辽海之外，臣忽三思，烦愁并集。
Now that we have abandoned the impregnable safety of Jincheng, and traveled far beyond the Liaodong Sea, I, your servant, have given it much thought, and worries and anxieties have come together.