"They're not trying... Power here, those of the voices in our heads..." Who is the "They" in "They're", in "Power", in "those"? And FWIW I don't have any voic

"They're not trying... Power here, those of the voices in our heads..." Who is the "They" in "They're", in "Power", in "those"? And FWIW I don't have any voices in my head except my own, which is laughing right now. It is pretty infectious laughter!8-))