The teachings from the Course are non-dualistic teachings. If you return into historical China or back into India, you would've heard about Advaita Vedanta. Advaita in fact implies “not two,” and that is a strategy for referring to the fact that there's a oneness which connects us all. And also https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw