Very simply the entire separation from God is a matter of becoming confused about what is true and what is false. That which is really true (God's truth) has been associated with all the properties of what is false, and that which is false (ego truth) has been associated with all the properties of what is true. This produces a state of TOTAL CONFUSION. But this all hinges around your BELIEF in what is true and what is false.
Wherever you place your sense of "what is true", you will anchor yourself to that and BELIEVE that it's completely true. You'll also believe you are 100% sane to believe it. And you'll defend it to the death because you think it is your life. Even if you're becoming identified with something very untrue and you are very mistaken, your BELIEF that it's true will blind you and distort your perception.
You will SEE or regard genuinely true things as enemies, the opposition, false, unwanted, attacking you, trying to steal away your truth. And only anything that supports, resonates with, seems to confirm or justifies your current truth will be seen as accepted, truthful, allowed, welcomed. So you could be right in the middle of being extremely confused, believing something totally false is true and real, defending it with your life, trying to keep everything else from undermining it, believing you are TOTALLY justified and sane, while simultaneously being very very mistaken.
So wherever you are AT right now, whatever your belief system is, whatever is TRUE for you, you actually believe you are FULLY in the truth right now. Doesn't matter how mistaken you actually are. Even if you believe death is life and hell is heaven and the Holy Spirit is your sworn enemy, which the extreme of ego does believe, you'll think you're totally totally "right" to believe what you do, that's it's reasonable and makes sense to you. And any insinuation that you might be mistaken will be experienced as a threat, an enemy, an attack, by some person who is obviously "wrong", and are seen as someone you have to defend against and counter-attack to keep them from infiltrating your sacred truth.
Everyone does this. Every single person with an ego is doing this. Because every such person believes something is true which isn't, is mistaken and confused, and wants to protect and defend all the lies that they think are not lies. And so what happens is, if you try to tell someone something that isn't "their truth", it will conflict with their truth instantly. And this will be experienced as conflict and there will be a war that comes from it. Particularly if a person is very strong willed or stubborn, they will resist being questioned or undermined moreso than others. Or in other words, there is an unwillingness to learn, and too much faith placed in being right/true already instead of humility or self-honesty.
Others may be in general more open minded or more willing to listen and consider alternatives which may well lead to them having to question their own beliefs. And that's a position of greater self honesty and willingness. It takes a "little willingness", therefore, to be willing to open up to the possibility that you might be mistaken. That what you really firmly think is true, might not be. And if indeed what you believe is not actually true, but you think it is, you will make no progress towards God without being a little bit willing to question just how true your beliefs are. His truth cannot become true for you, until you can accept that your fake truth is FALSE.
This is more or less why the majority of people (truth defenders) do not agree with each other, and also is why most of those who do agree with each other are either mutually sane or just happen to share the same delusions. This is how the ego forms "allegiances" with people who seem to oppose their truth the least, forming a circle of "friends" who support and uphold their mistakes without questioning them. This is all begun in the ego's FIRST law of chaos, which says that the truth is different for everyone!
Everyone believes they KNOW the truth. They HAVE the truth. This is a fundamental carry-over from BEING the truth prior to the separation. Everyone attached themselves to SOME kind of truth no matter whether it's true or not. It's only a matter of sorting out what is *actually* true in terms of God's truth, from what is a fake truth in terms of ego, in order to proceed in the direction of Atonement. While we cling to lies, we are kept in the dark and away from eternal life.
The thing is, you can present a greater truth, you can explain it, you can show it and demonstrate it as clear as day, but if someone is not WILLING to undermine what they believe is already true, and doesn't see a reason to abandon their existing false beliefs, they simply will stay right where they are. Because they think they already have all the answers. All of the truth. And that they're very right about it, having convinced themselves over and over again WHY this truth is supposedly true. And this especially becomes a problem when very abstract or fundamental "cornerstones" in the belief system are upheld, supported, and reinforced, by a whole host of beliefs that keep the person highly unwilling to question fundamental issues such as whether the body or the world are real, or whether you are supposed to die, or what miracles are capable of.
We build great defenses against admitting to being
mistaken. We resist it. We in fact experience "the real truth" as an opponent or enemy, come to war with us and destroy us, and it keeps going on and on about this and that as if trying to make something "false" true, when you obviously know better. In other words, the real truth, at first, is experienced as the very thing we DO NOT WANT. Our ego ensures we see it as our nemesis, come to destroy us. The idea of oneness alone is enough to scare the pants off the ego since it implies the end of separation and thus the undoing of ALL false beliefs and false identities. This is why the ego wants NOTHING to do with the Holy Spirit. And this is why we have profound RESISTANCE to accepting the atonement.
Anything of the true nature of God, anything to do with God's laws, anything to do with the Holy Spirit, anything to do with breaking the laws of physics of this world, anything to do with performing extraordinary supernatural miracles which would probably shock most people, anything to do with Spirit, anything to do with receiving input from outside of this dimension, anything which would prove you are not a body or that God did not create the world, or that death is fake and can be undone, anything like that... which would bring doubt into the mind about what our MISTAKEN beliefs say is true, is seen as a THREAT, and a danger, and an attack. And WE DO NOT WANT IT. And seeing it as a threat we put up defenses against it, which by the way induces sickness.
And yet, all of these things are truth based, all of them are of God, and all of them are benevolent. So it is not that the truth IS an attacker, it's that it SEEMS like an attacker when YOU are an attacker. When YOU believe in a false truth you are believing in attack while BELIEVING you are peaceful, BELIEVING you are being neutral and objective, but are seriously biased away from truth. This is why most people DO NOT WANT the truth, they do not want miracles, they do not want the Holy Spirit to do anything. The very idea of Him having a power that causes things to happen that you can witness scares the pants off people who would much prefer to be in control of life and keep A Course in Miracles nice and small and safe and tolerable. Which has resulted in the various watered down "sanitized" versions of ACIM being spread and taught.
So this is a fact.... if you are not in God's truth, you will experience God's truth as a sworn enemy that you DO NOT WANT, and which you think is WRONG. And that means in order to approach the truth and genuinely wake up and become spiritual, you may well have to encounter or at least deal with, your false perception OF the truth and therefore get past this belief that true things are false, that holy things are hateful, that life is death and that the Holy Spirit can't be trusted. It more or less means... opening up to accept what you DID NOT WANT TO accept, and that REQUIRES you having a "little willingness" (eventually total willingness) to question your beliefs about what is true already. And that's going to require some radical self honesty and impeccable reasoning.
The Holy Spirit only wants to help you and heal you and give you love and support. He is not a threat at all. But He DOES represent the opposite of the FALSE truths (lies) that you've told yourself, and that means THROUGH those truths you will defend against him. This is how we chose AGAINST Heaven in the first place, substituting truth for another truth. We tried to MAKE God out to be evil and opposite to what we want. We tried to replace life with death, and now *actually believe* that death is salvation. That means the road back home MAY SEEM to be unwanted, uncomfortable, undesirable, upsetting, frightening and something you DON'T WANT, merely because of how confused you are. It may seem to had in the WRONG direction, just as Jesus says that often our greatest advances are SEEN as our worst retreats and vice versa.
WILLINGNESS is key to going home. No-one comes to the Atonement without it. God does not coerce. And the Holy Spirit will not do ANYTHING on your behalf until you are willing to invite him to do so and trust him to do so. Your free will is respected. But you DO have to be willing to want a different truth. To reconsider that what you believe, may not be true. That maybe even though you have *A* truth right now that seems consistent and whole, maybe it's NOT. Maybe it's not actually God's truth. And maybe that means you're going to have to surrender and let go some stuff that you valued, believed, and wanted, that isn't serving you on the way home. This is the work we have to do. And it takes a lot of willingness and honesty and surrendering of what is not true or worthy of a Son of God.
Moving towards God can ONLY occur through your FREE WILL. And this is why there is a required "development of trust" and a "sorting out" of what is really true and what is really false. Trust has to be developed by gradually putting aside fear and TRUSTING the Holy Spirit to do something for you or "to you" on your behalf, for your highest good. To accept HIS truth and way of perceiving with forgiveness. What is false has to be sorted out from what is true so that you are not confused about which is which, and can have accurate true perception. True perception is a state where the truth is RECOGNIZED as true, and what is actually false is RECOGNIZED as false. It's not merely a state of only perceiving the truth, it's a state of perceiving TRUTHFULLY so that false things REGISTER as false. And only in that state of SANITY and clarity and accuracy are you ready to go Home.
A little willingness is all it takes to get started. To be a HAPPY LEARNER, willing to learn "new tricks". Willing to question what you assumed was always true. And willing to open up to a new truth that's bigger and more true than anything you dreamed of.
"The holy instant does NOT come from your little willingness alone. It is ALWAYS the result of your SMALL willingness COMBINED with the unlimited power of HIS WILL. You have been wrong in thinking that it is needful to prepare YOURSELF for Him. It is impossible to make arrogant preparations for holiness, and NOT believe that it is up to YOU to establish the conditions for peace. GOD HAS ESTABLISHED THEM. They do NOT wait upon your willingness for what they ARE. Your willingness is needed ONLY to make it possible to TEACH you what they are."