Let’s face it, we all have voices in our head. Sometimes we have conversations started by memories from the long-time-dead contacts we have had. We get tired and complexed at some of the problems we cannot solve by allowing these conversations.
Often the voices are the sounds made by relatives or ‘ friends ’ who may never have actually said those words when they were alive but come back to HAUNT. I am not, however, saying that there are such things as ghosts.

One thing I do know is that the most important voice in your head is that of your true and free self speaking to your true and free self.

The evidence for this is statistical. 

You are more likely to die from suicide that from an altercation with a completely separate person. Look up the statistics.

So do not be afraid of voices in your head - oppose the ones from the past that would do you harm . Reason and logic with yourself. Think through all the people who have influenced the way you think from childhood. Rank them and eliminate them one by one. Defeating the top man or woman often makes the rest easier to deal with. Make sure that you are free to think the way you want to- become a freethinker over anything. Sorry about too much advice . Feel free to ignore or give a better version.