It is confusing when ACIM teaches that what is not in alignment with the truth of our Oneness is not real and does not even exist. How can it not exist when our eyes seem to “see” a whole world all around us? It is confusing because we forget the eyes of our physical body, thought to be outside of our mind, function only to serve our perception of what else is out there. We believe it is possible for there to be something “outside” the one Mind of God so our eyes must confirm this is true. Remind yourself that your physical eyes can see nothing real for there is nothing outside you to see. And what is not part of you does not exist.