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

This quote by Eric Hoffer is a pointer that an empty head is not really empty. It is filled with ideas, opinions, and beliefs that are not always real or useful. This can make it tough to present new ideas or principles to somebody who has an empty head. It is like attempting to stuff something into a container that is currently loaded with junk. The individual may be resistant to new ideas because they are so utilized to the ideas they currently have. It is very important to bear in mind that an empty head is not really empty which it can be tough to introduce new ideas to somebody who has an empty head.