It is likely there are some people that keep it a secret. A lot of people joke about it. They say things like, "It is alright to talk to yourself or to God as long as you don't hear someone talk back". That is a bit of a dilemma but for all (or most) intents and purposes, it is better to just ignore anything like that (unless it is God talking to you). Oh, the perils of the mind. What God says is supposed to be true and what szs see and hear is not true or dependable and therefore, not good (not what God is saying) because it is not true since it is not dependable. What gives a lie or image its power is if or when people believe in it. Otherwise it would be powerless. We need to believe (and fear) good will happen instead of bad.