The ego's thought system resulted in this physical universe including the Earth. It is all based on separation and exclusion and difference. The ego's way of THINKING and reasoning logically, is completely consistent, yet based on "separating out" everything and comparing the parts to each other.
To make forms of matter or objects, the ego has separated things out, claimed that one thing is different to another, has given certain illusory properties to one object which another object does not share, and thus establishes that they are not only "different" from each other, but that because of these differences they must be SEPARATE. Not just a little separate, but COMPLETELY separate.
So for example because an apple looks very different and has different taste and structure and color to a banana, the ego reasons that the apple is different to the banana, not sharing the same qualities or characteristics, and therefore they cannot be ONE THING, and therefore must be TWO THINGS.
This is not merely a way of thinking ABOUT the world we made. It actually is the thinking BEHIND the world, the thought system which PRODUCED the world, and every part of physical matter in this universe proceeds according to these same rules.
Every atom is unlike the others, no two objects can share the same location, everything is different and changes, no two things are allowed to be seen as exactly identical, and because all things are different to each other this gives them a fragmented "identity". This is why regarding someone as a human body "identifies" the person AS being that body, because that body clearly does not overlap or share anyone else's body, and looks different and has different form, therefore is not the SAME, and therefore is SEPARATE.
So separation is BUILT IN to this entire universe's fundamental fabric. It's built into all matter. In fact, because differences mean that something applies to one thing and not another, another word for that is MURDER. From it has come the ego's laws of cause and effect which state that one object can affect another object WITHOUT receiving any consequences, which is exactly the same thing as "getting away with murder". This is because the ego's thought system is murderous, and all forms of INEQUALITY and competition or "not being identical" are forms of murder.
Sacrifice is also completely built into this universe. Because the ego has separated everything out into discrete separate parts, which are each different, its reasoning extends from this. And so it SEEMS logical to say, because oranges are orange and this banana is yellow, it can't be an orange. That seems to make perfect logical sense, except it is insane. It is insane because the banana and the orange are being KEPT APART by the separation idea, they are being made to look DIFFERENT to each other on purpose, and they are a PICTURE OF DEATH.
That means that for example if I eat the banana, there is only an orange left. And that means, the banana has now been sacrificed, because there is now a LACK of banana. Lack is fundamentally built into this universe. It's part of the laws of this world, the ego's laws of chaos. In this world, to give "matter" to someone means to LOSE IT, and therefore to decrease what you have. It's not merely your thoughts about the world that produce this kind of conclusion, it's literally BUILT INTO the way that this world's "reality" is set up. Therefore this universe is fundamentally DRIVEN by scarcity and LACK and ATTACK.
Then, whenever we think in terms of how we usually "reason out" something to do with this world, we actually have MAPPED our logical reasoning onto the way this world functions (or is an extension of it). So now it SEEMS to make sense to say, if Paul's body is not the same as Susan's body, then Paul is not Susan. This makes SENSE, but it is INSANE, because Paul and Susan are NOT SEPARATED by their bodies and the Holy Spirit recognizes that they SHARE MINDS and therefore they are IDENTICAL and NOT DIFFERENT and are NOT ENEMIES and therefore there IS NO SEPARATION between them as such.
So the Holy Spirit's thought system is TOTALLY OPPOSITE to how the ego thinks, God's world is TOTALLY OPPOSITE to how this universe functions and is structured, God's MIND thinks totally opposite to how this world thinks, and all of the logical conclusions that "make sense" to the ego are UTTER NONSENSE in God's eyes.
Yet we use and trust and rely on the ego's way of thinking to "learn the course" and to try to understand what Jesus means and what the nature of Heaven is and whether or not God has created many sons or minds, etc.... all producing FALSE conclusions that make SENSE to the ego. And because we TRUST that the ego's "sense" is actually sanity, or a sane conclusion, we are too quick to ACCEPT that these conclusions are the truth about God's creation, not realizing that we're totally overlooking and distorting His nature USING the ego as our guide to God.
In God's world, everything is essentially IDENTICAL In its nature, nothing is in competition, there aren't any "differences", one thing is not "separated from" another in the traditional ego sense of total isolation, and yet there are many individual beings which the EGO reasons cannot be possible. The ego sees separations where there are none, and sees singularity where there are distinctions. It cannot see how God could have "parts" or "creations" or "sons" without FALSELY concluding that this indicates isolation.
God and the ego do NOT communicate, so for the ego to think it can look at God "sanely" and make correct evaluations, is also insane. But we CAN learn to think like God and to share His mind and see what He sees, learning WHY it is possible for Him to Create the way He does, in violation of what makes sense to the ego.