There are ideas of reference and delusions of reference. With ideas, you can be persuaded that the ideas, like people plotting to hurt you, aren't true. When you can't be convinced that the ideas aren't true, they're called delusions of reference.

There have been periods of delusions of reference in my life where my brain is convinced that what it heard is true and I wouldn't listen to reason. I've never had the kind of delusion of reference where you think characters are speaking to you through the TV.

If you Google "good therapy ideas of reference", there's a little information on the Good Therapy web site.