An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head.

An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head.

空着的脑袋并不一定是空的;它塞满了垃圾。因此，要把任何东西硬塞进一个空脑袋里是很困难的。

-- Eric Hoffer 埃里克·霍弗