If I don't keep any guard up then it's like hearing every thought of every person within a certain radius, non-stop. When I was a child it gave me horrible headaches. I have control over it now, and I am able to hear what I want to hear. I can force myself I can force myself into someone's brain, but I don't like doing it, for a multitude of reasons. The greatest of these is that it's simply wrong to do so.