A Course in Miracles, the book, unfortunately does not contain everything there could ever be said on every subject.
It's important to recognize this. Since there is so much "truth" in the book, or conveyed through its words, many people come to believe that truth is ITS FORM. Ie the specific words it uses is the "entire truth".
This is especially because the course is trying to communicate to us "the whole truth", the exact perfect truth, and nothing but the truth. But if we start to think that the words used, the form of the book, and its limitations, constitutes what the whole truth is, we become obsessed over the specific words.
Then there are debates about what the words say with a quote-war erupting, competition between versions and so on. People will say "where did Jesus say that" or "where does the course say that".. and things will allegedly not be "proven" unless you can find specific words which "say it" in a specific form.
Words themselves are not meaning. They are symbols, carriers of meaning, and there are many ways to say the same thing. In the course Jesus does the best He can, but he's working with a language based on limitation. He can only put a certain amount of words into the book and only a certain amount is said on given subjects. But even moreso, the MEANING that he intended is sometimes lost or not seen at all if a person focuses solely on the form of the words.
Meaning is always deeper than the words. If you are a course student who is always trying to find out what the words explicitly say as in, the exact words used, as if this gives you the meaning of the course, then you will become limited right along with those limiting words.
There are parts of the Course which Jesus later "clarified" necessarily, such as in the clarification for terms. He even said some things later in the "notes to helen" about how He made his body disappear, which was not mentioned anywhere else in the course and those who have not read it would likely come to some other conclusions about how the dream is overcome.
Jesus did NOT speak at "great length" on every topic, and some topics he barely even touched on, giving us precious few words representing colossal subjects, such as the definition of very large terms like "world" and what exactly the real world is or is not, and what he exactly means by the world being "translated" into heaven, and so on. Or what he means by a "universe". There are many many areas of the course where we really could've used a Q&A session to really get into the details of these things and become much clearer about them. This lack of clarity results in a lot of debate and arguments and speculation.
It is not possible to make accurate conclusions based on this limited material at times. You can't just point to some quoted piece of text and say, that's what the course says, or means, or teaches. The meaning is beyond the words. And I've seen plenty of people putting their own meaning onto the verbatim quotes and claiming that this is what the quote "clearly says and means". .but it doesn't.
Don't be deceived that the FORM of the course holds all of the truth in it. It is just a set of symbols trying to point to an experience or meaning that runs deeper. Learning what the truth is and what the course really means or intends, requires you to generalize the learning. You have to take something Jesus said over here and something he said over there and make sense of how it fits together. And in that area, you will find a lot of people disagreeing.
At some point we are to leave the course behind and go to God with empty hands. That's because the course itself is a MEANS to get there, not the end. Don't put the course on a pedestal and worship its glorious words or the idol worship of anyone who wrote or edited it. That's not what it is FOR or about. Beware of the FORM.
"Nothing so blinding as sight of form."
What we really need to do is learn the core truth and how to apply it and work with it to produce miracles and healing and awakening. And to develop TRUST in Holy Spirit and Jesus as our teachers and to let go of the ego.