Answer:
Using what Polonius said in his "farewell speech" to Laertes in Act 1, scene 3, we can conclude that he is a meddler, always poking his nose in everybody's business.
Introducing the concept this way creates a sense that he is almost entirely incapable of recognizing other people's separate personalities; he can only imagine others as having the same motives and desires as himself, to the point that he tells his daughter "what to think".