《论衡·卷二十五·解除篇》
胡地、越地的人，口耳相类同，心意也相似，对口交耳进行交谈，尚且不能相互了解，何况人与地并不相似，地的口耳与人相隔甚远啊！
胡、越之人，耳口相类，心意相似，对口交耳而谈，尚不相解；况人之与地相似，地之耳口与人相远乎！
The people of Hudi and Yuedi, though similar in speech and habits and resembling in mind and intention, yet, when conversing face to face, can hardly understand one another. How much less can man and earth understand each other, seeing their speech and habits are different and their face and person far apart!