Some people say the course is about changing your mind, as though changing the body is a separate thing or not what you are supposed to do.
This is the belief that mind and body are separate.
So if you then have to choose one version of MIRACLES vs another, you'll either decide miracles are supernatural and physically transformative, or that they are only changes in mind.
The important thing is, this idea that mind and body are separate, is a mistake.
Body is not separate from mind. Body is an illusion that the mind is dreaming, WITHIN ITSELF, and is made of mind-stuff. It is idea and thought. That's all. Just an image in the imagination.
So this is where the two camps JOIN, because now if the body is an aspect of what the mind is thinking, perceiving, doing, then as the mind changes that means the body MUST change.
The two camps of "separate mind" and "separate body" are now joined by this one piece of information - that the body and mind are NOT two things. There is ONLY mind, and it encompasses the body and the world and the universe.
That now means that not only is it true that the Course is about changing your mind/perception, it ALSO means that the Course is about changing the world through supernatural means. ie, mind over matter, or the power of the mind, to demonstrate and reflect the mind's state.
So we are not living in a physical world as such, we're living inside a giant MIND. And all the objects you see are IMAGES in the mind - just ideas, imagination. And nothing else. There is no such thing as physical matter or a "separate body".
And so as the mind changes, so too do the images in the mind change, thus the world changes. This is why the supernatural aspect of miracles is actually perfectly in harmony with the Course's ideas of changes in perception.
As you look at someone's body you are looking at content within their MIND.
"The world IS perception" <- Jesus.
This also leads us to realize that when the course talks about "the world you see" in relation to perception, we most likely have grossly misunderstood its meaning, given that we interpreted it to mean the perceptual content of our inner mind, rather than recognizing that it was describing the world AS part of our perception. This has led to all manner of misunderstandings about what the course means by correction of perception.