Yes, absolutely. Scripture, especially the Old Testament, had some VERY tough words for people who claimed God talked to them when He had not. God wanted these people to be stoned. Instead the people ended up just tolerating them. Eventually, by the time of Jeremiah, people were more willing to listen to these "lying prophets" than to what God was actually telling the people.
There is danger in accepting anything other than what is written.
Unless it's something that Mary had to come back and tell us; then it's ok.