Someone said somewhere (probably Erin but I can't remember or cite the reference) that ego often speaks from a viewpoint of fear. Things like -
"What are you thinking?"
"You could never do that."
"That's a good way to make a fool of yourself."
and so on.
One reference I can cite is this - which is helpful in recognizing and establishing contact with your HS - Erin Pavlina - Psychic Medium, Spirituality, and Personal Development » Blog Archive » How to Meet your Higher Self