When you hear someone's thoughts, you become aware of very private things you have little interest in, like "I must wash the dishes tonight", or "my son is going to call me at 8:00 p.m.".You also missed this.
Sorry, this didn’t make sense. Let me ask again.
How can you tell the difference between hearing someone’s thoughts versus hearing their voices?
When you hear someone's voice, it's as if the person was whispering to you, except that the person is bypassing your ears, and "talking directly into your brain". In addition, like in ordinary whispering, the person who is talking to you "mentally" can control what she/he says.