《明史·列传·卷一百一十四》
深山穷谷，蛇虎杂居，毒雾缭绕，人烟稀少，因为寒暑饥渴患痢疾死亡的人不谈。就是一根木材刚放倒，千人也难以移动，倘若遇上阻隔艰辛，必然出现伤亡。
丈八之围，非百年之物。深山穷谷，蛇虎杂居，毒雾常多，人烟绝少，寒暑饥渴瘴疠死者无论矣。乃一木初卧，千夫难移，倘遇阻艰，必成伤殒。
In deep mountains and poor valleys, snakes and tigers inhabit, poisonous fog lingers, people are rare, and not making any mention of those who die from dysentery caused by heat, cold, hunger, and thirst. Even just when a log has just been felled, a thousand people cannot move it. If they encounter obstacles and hardship, injuries and deaths will inevitably occur.