《韩非子·功名》
千钧重物依靠船就能浮起来，销株轻物没有船就沉下去，不是因为千钧轻而销铢重，而是因为有没有依靠船的浮力这种势的差别。
千钧得船则浮，锱铢失船则沉，非千钧轻锱铢重也，有势之与无势也。
A thousand-jun heavy object can float with the help of a boat, while a light object sinks without a boat. It is not because a thousand jun is light and a tiny particle is heavy, but because of the difference in potential, whether there is the buoyancy of the boat.