《韩非子·外储说左上》
现在它厚实得没有空隙，就不能剖开来装东西了；它重得像块坚硬的石头，就不能剖开来斟酒了。
今厚而无窍，则不可以剖以盛物；而任重如坚石，则不可以剖而以斟。
Now that it is so thick that there are no gaps, it cannot be cut open to hold things; it is as heavy as a hard stone, so it cannot be cut open to pour wine.