You may not realize it, but almost everyone in the world has adopted a very unnatural way of thinking. It is based entirely on separation. And this thinking massively distorts A Course in Miracles.
It starts with very simple logic. That "EITHER" this is true, "OR" that is true, but "NOT BOTH". Another way to put this is "this is NOT that", "they are not the same".
This is what we call EXCLUSIVE logic. This thing excludes that thing. One thing is not another thing. Two things are kept apart, excluded from each other. The whole ego thought system runs on exclusive logic, because it was the attempt to EXCLUDE (deny, separate, shut out).
Another way of putting this is the idea that "nothing is shared", as if everything has to be kept in separate isolated boxes, like prisons. What is one thing, must be kept apart from another thing. And this produces what we call "duality".
So then we think along the lines of, "either this is true or that is true, but they can't both be true." Or that "I can choose this or that but not both."
We use this pattern of thinking all over the place. It maps very well to the physical world. Physical objects are a projection of the ego idea of separation, that all things are separate and everything is different. This is really the logical idea of "GOD IS NOT" .. the negation of heaven's reality - opposite to "GOD IS".
For example, I can turn left or right, but not both. A banana is not blue. My body is not your body. I can move up or down. A car is not a house. I can park in the first space or the second space. I will eat the red apple or the green apple. I choose between a vacation in Florida or California. An apple is not an orange. A dog is not a cat.
This seems to work fine in this world. The world itself is a system of exclusion and separation, because it is a projection of the idea of separation. It has produced a world where everything is different. And where it seems that one thing is not another thing. This is the illusion of form. The problem is that we now use this way of thinking about EVERYTHING. Even when thinking about things which are NOT part of the separation, such as God's reality.
The really big problem is that heaven, God's Kingdom, the Sonship, DOES NOT comply with an "either/or" kind of system. Heaven is about INCLUSION, not exclusion. It is about sharing, not isolation. It is a system which runs on a VERY different logical basis.
Heaven operates on a "BOTH/AND" kind of structure. Where BOTH are true. Where the truth applies to one thing AND another. Where two things can SHARE everything. This even means that one thing can be two things simultaneously, and two things can be one thing simultaneously. Nothing is required to "stay in a box by itself."
The notion of separate boxes does not apply to the Kingdom. It is not divided up by SPACE, because there is no space or time. Things in heaven are not limited, or required to exclude each other. They are not isolated to separate prisons, kept apart, or separated off.
EVERYTHING in reality abides by an entirely different system of logic. This system of logic is part of the thought system of God. It is how God himself thinks and creates. It is totally opposite to the idea of "either this or that". It TRANSCENDS boundaries.
For example, what is true of God is true of the Son. The truth is the SAME for both of them. What is true of one son, is true of another. This forms the Golden Rule. There is ONE truth, which ALL things share. And sharing is a fundamental property of reality.
True sharing means, that the whole of something, transcends all separations and walls, and is fully present in ALL locations. It's not a matter of "is it this or that". It's more a matter of it being BOTH this AND that. BOTH/AND is the system of heaven, and "NOT BOTH" or "NEITHER" is the system of the separation.
For example in the course we're told that ideas can be shared and both the giver and the receiver can have the same idea, leading to an increase. That by sharing, or joining, two beings can both have everything. That by giving, you in fact receive, rather than lose.
In an either/or system, EITHER you can have something, OR the other person can have it. This is true of spacetime, but it is NOT true of heaven. In heaven, even if you give everything away, you KEEP it. This is how God was able to create you, by giving ALL of himself, and yet still retains all of himself. In ego terms, God should've ceased to exist if he truly gave all of himself.
The only way to understand how it is POSSIBLE, for both me AND you to have everything, is to think in terms of both/and. This is called paralogical reasoning - you can google it. If I give everything to you, we can BOTH have all of it. We now both share the entirety of it.
This obviously transcends boundaries because, the ego would reason that whatever I give away I lose. If I give you half my pizza, I only have half a pizza left. But in heaven, this does not apply. We can BOTH have the WHOLE pizza at the same time.
In A Course in Miracles, every subject and discussion related to the ego's realm of separation, can be thought of USING exclusive reasoning. Because it is a system of separation. However, as soon as you start to think about anything PRE-separation, about heaven or reality or God or the Sonship, or real relationships between created beings, you CANNOT USE IT.
If you do, you in fact will end up with two things happening. 1) You will project "required separations" where they do NOT exist. 2) You will fail to acknowledge separations where they DO exist. An either/or process of reasoning does NOT map to heaven, and is completely distorting of it and blind to its nature. They are INCOMPATIBLE.
This especially happens for example when people try to understand the idea of the "one son". There ARE indeed many statements that God has only one son. But, there ALSO are many statements that God directly created many sons. In reality, permanently, as brothers. This is the full scope of the course material. Jesus says BOTH things are true.
So then what happens is, people start to think WITH the ego about this. They start looking for separate boxes. They want to put things into one box, OR another box, but not both. So they'll think, ok, it seems more whole to say there is only ONE BOX, and so the "one son" statements must be true. And since TWO boxes seems to be "a separation", the idea of many sons must be false.
This is however a complete logical failure. Heaven is not structured by boxes or separations like this. One son, is in fact, another son. EACH individual being God created, is in fact, ALSO, the other beings.
"One brother is all brothers. Every mind contains all minds, for every mind is one. Such is the truth." (urtext W161L4)
So we see a lot of SEEMINGLY contradictory statements, which in a both/and system are NOT contradictions. Like this:
"God has but one Son, knowing them all as One." (urtext T9E3)
What is going to happen to this if someone uses either/or reasoning? You'll say, EITHER, God has one son, OR, God has many sons. And that they can't BOTH be true. You will likely side with the one son part, and relegate the "them all" to some other realm of separation, such as part of the ego or dream or split mind. This is an error.
It is in fact true, that God has one son, which IS MADE UP OF, many sons, which is the Sonship. And these many beings ARE many in number. BUT, they are not JUST many, like in duality. They are in fact SIMULTANEOUSLY ONE. EVERY son of God, is THE ONE son of God. EACH son of God, is Christ. They all SHARE themselves, so fully and completely, that they ARE each other, while STILL also being many individuals. THAT is what A Course in Miracles clearly states.
What you have to then do is recognize the limitations of how you think, and realize that you need to adopt a HUGELY different way of thinking, if you are to understand anything to do with reality. Any subject to do with pre or post separation, cannot be thought of in either/or terms. If you do, you will DISTORT IT.
This distortion has led to all manner of completely false conclusions. Such as, that the one son split into many parts in the separation. This is not true at all. God created many children BEFORE the separation even happened, and each of those children IS the rest. They all share each other. This sharing is their oneness and unity.
This has also led to the distorted conclusion that there is only one son at all, and therefore that this only child has dreamed of being separate. This is NOT TRUE. "Christ has never slept". The one son DID NOT go into the separation. Only some of the individual parts did - some of the sons of God. This is explicitly stated in the course.
The wrong kind of thought process also leads to the false conclusion that you, in this world, are the only son of God, and everyone else is just "you". As if they don't really exist as independent beings. This is FALSE. This is not what A Course in Miracles teaches. It seems to make sense to those who think with the ego. In truth, the dream of separation is a collaborative dream by many sons of God, who were brothers BEFORE this even happened. And other people DO have free will.
So you have to beware. Watch your thought process. Look at the kind of reasoning you're doing. ANY time that you are in the "either this or that" mode, you are prone to massive errors. Because it is an unnatural, separation-based way of thinking. You are in fact thinking WITH THE EGO when you do that. Thinking with the ego, about NON-EGO things, is going to totally destroy the true nature of those things.
This is the sole reason, in my opinion, why so many people are so confused about ACIM and its teaching. Everyone is assuming that heaven is an either/or state, like spacetime. That's its sort of a second spacetime, with the same reasoning and logic and thought process. It is NOTHING LIKE IT. It is totally alien to this world and how this world thinks.
The world simply thinks backwards and with the ego, and we have to learn another way to think. Human thinking is ALIEN TO the way God thinks, the way heaven is formed, the way the sons of God relate to each other, and how reality is structured. Using an ALIEN thought process to think about what is NATURAL, is going to show you thinks seeming to make sense which are totally nonsense. What makes sense to the ego is nonsense in truth. And the ego's truths about heaven are totally nonsense.
The course is trying to get you to think in a way that is TOTALLY OPPOSITE to how the world thinks.
"This IS the miraculous power of the Soul. The fact that each Soul has this power completely is a fact that is entirely alien to human thinking, in which if any ONE has everything, there is nothing LEFT." (urtext T3G15)
"This is not the way the world thinks, but you must learn that it is the way you think." (urtext W17L1)
"There is only one way out of the world's thinking, just as there was only one way INTO it. Understand totally by understanding TOTALITY." (urtext T7H12)
"This is the first idea we have had which is related to a major phase of the correction process; the reversal of the thinking of the world." (urtext W11L1)
"The resurrection is the denial of death, being the assertion of life. Thus is all the thinking of the world reversed entirely." (urtext M29A2)
"Yet it is the final lesson in which Unity is restored. It goes against all the thinking of the world, but so does Heaven." (urtext M15A3)
"Today's idea, completely alien to the ego and the thinking of the world, is crucial to the thought reversal which this course will bring about." (urtext W126L1)
"This has been emphasized throughout the text and the workbook, but it is perhaps more alien to the thinking of the world than many other ideas in our curriculum." (urtext M5H1)
"To give up all problems to one Answer is to reverse the thinking of the world entirely." (urtext M5J1)
"The world will end when its thought system has been completely reversed." (urtext M15A4)