《淮南子·说山训》
现在那些在黑暗中饮酒的人没有不将酒溢出的，假若他能将此持平，那么即使是愚笨的人也不会有失误。
今夫暗饮者，非尝不遗饮也，使之自以平，则虽愚无失矣。
Now, those people drinking in the dark have not not spilled any wine, and if they can hold it level, even a stupid person can do it without spilling it.