The higher self what is the higher self, your higher self is you at the highest level of consciousness. It's the part of you that is directly in touch with the universe or God or the one creator. However you look at it. your higher self is all your souls journeys past, present and future. I personally think that the energy of all things or God is in all of us, but we forget when we come to soul school life. Remember, you are the universe experiencing itself in as many ways as possible.
In that aspect, we are all one. We are all a piece of the universe, which is infinite, having a human or other being experience.