What if someone could hear every thought in your mind? You know, everyone - including those you don't want to admit to yourself that are yours; those that make you embarrassed of actually admitting they have sprung from your mind. Those that make you not even recognize yourself as the person you think you are, because they are so evil, selfish, stingy, cruel, and insensitive.
Can you imagine if someone you consider a friend could know every thought in your mind? Would you still have a friend?