The only other book I've read that's similarly inspiring, or alluding to the potential we have, is Yogananda's autobiography of a Yogi.
In this book, the experiences and explanations that are given are quite eye-opening. If the stories are to be believed, and it's to be expected a lot of people have a hard time accepting it, here is some of what is claimed:
God has a power which He shares fully with us and which we are meant to use, and this power is capable of a) manifesting any object of any kind, b) healing absolutely all sickness, c) overcoming death, d) facilitating the transcendence of space and time for travel, e) being not only immune to but able to control all aspects of events and objects in the physical world, f) being able to materialize and dematerialize the body, g) the instantaneous manifestation of food and money supplied by God meaning you no longer have to rely on any limited resource or sources of objects from others, .... and various other things we'd consider 'miracles'.
Basically, what it's suggesting is, literally, that we are capable of absolutely ANYTHING if/when we join with God. It doesn't just mean that we give up everything and go to God, either, although some people eventually reach such a high position that they never want to leave there, although they can (like Jesus). It means that we can actually 'live forever' joined to an unlimited supply of provision. The people in the book, the masters, are hundreds of years of age, and yet appear to be 30-40 in age, youthful and in perfect health.
These kind of things give me more of a picture of 'whats possible' and clues as to what A Course in Miracles might be saying and meaning.
I realize now that when I read certain things in the Course, even if I THINK I am being absolutely open minded, I am still actually building upon meanings and learning that I had accumulated from before. Even if I think my learning is more open minded than others, it STILL is resting on what I already think I know and that skews the potential meaning. Also I do not know what I don't know... there are things, truths, that I simply am not aware of, and so when I think I am exactly 'getting' what the Course says, maybe I still am not... there could be a context or laws or information outside of my current awareness.
Then when I'm exposed to information like in this series of books, it makes me 'think twice' about what I thought I knew. It's eye opening.