The teachings of the Course are non-dualistic teachings. Should you go back into ancient China or back into India, you would've heard about Advaita Vedanta. Advaita really suggests “not two,” and that's a way of referring to The actual fact that there's a oneness which connects us all. For that https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw