The teachings from the Course are non-dualistic teachings. In the event you go back into ancient China or back into India, you would've heard about Advaita Vedanta. Advaita actually indicates “not two,” and that is a way of talking about the fact that there's a oneness which connects us all. https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw