《资治通鉴·唐纪·唐纪五十七》
如果天下真的有神仙存在，他们必定躲藏在深山密林中，惟恐被人发现。
借令天下真有神仙，彼必深潜岩壑，惟畏人知。
If the world does indeed have gods, they would hide in remote mountains and dense forests, for fear that humans would discover them. 