《淮南子·人间训》
这祸福同出一门，利害相近为邻，不是圣明的人是难以区分这其中的奥妙的。
祸与福同门，利与害为邻，非神圣人，莫之能分。
Misfortune and fortune come from the same source, and benefits and harms are close to each other. Only a wise person can distinguish the mystery in it.