Separation HAS occurred? Sort of.
Some people claim that it is impossible to explain the "tiny mad idea". It seems logical at first, because when the ego asks a question like "what if", it's not really a question, and the tiny mad idea hasn't "really" happened in reality. It has no real consequences in reality, and it's just a dream.
But the tiny mad idea HAS happened in IMAGINATION. It HAS happened in your mind, and you've "made it real to you". That is why you are sitting there right now reading this on your screen, which *seems* real. A dream "at all" wouldn't even be possible unless God gave you free will to choose to mis-create and dream.
"Whatever is true & real is eternal, & cannot change or be changed. The Soul is therefore unalterable because it is ALREADY perfect, but the mind can elect the level it chooses to serve. The only limit which is put on its choice is that it CANNOT serve two masters."
Your mind has FREEDOM, and therefore can be used to choose EITHER to will with God's will, or to will against it. Either in service to the soul/spirit, or in service to a fictional ego. This freedom granted you the very REAL "possibility" of being ABLE to make this choice, to use will against will, and to mis-create. God would not give you an `option` that could *actually* hurt you at all, and it has not, but this freedom HAS given you the ability to OPT not to laugh at the idea of separation, if you choose.
Jesus also describes below how while you have free will, it is necessary to choose both FOR (toward) God and AWAY from the option of ego/dreaming.
"While the ballot itself is a secret one, and the right to vote is fully protected, voting ALWAYS entails both election AND rejection. If two candidates are voted for for the same position, the machine cancels the ballot automatically.
This is necessary, because a split vote does not represent ANY REAL allegiance.
Free will is the attribute of the mind, NOT the Soul. The Soul always remains changeless, because it never leaves the sight of God.
The Creation of the Soul is already fully accomplished. The mind, if it votes to do so, becomes a medium by which the Soul can create along the line of its own creation. If it does not freely elect to do so, it retains this creative ability, but places itself under tyrannous rather than authoritative control. As a result, what it creates is imprisonment, because such are the dictates of tyrants."
So you can see here that the mind actually has the freedom to "choose to dream" if it wants to. It CAN place itself under tyrranical rule and seem to "sleep". Of course this dreaming is FICTIONAL and it is not REALLY happening in reality, it has no real consequences in heaven, but it IS still a "valid option" that you are free to entertain or ELECT.
This essentially means that, the tiny mad idea is a POSSIBLE CHOICE, but it is not a REAL choice. That's a vital distinction. You COULD choose to dream if you want to, to mis-create, to opposte God's will (or try to), but it's not a REAL option. It's an option of unreality that the mind is quite capable of making if it chooses to. This is why "heaven is a choice I must make" - the mind HAS to freely, willingly, elect to choose heaven, ie the only real option, and not the ego, which is an imaginary option you've tried to MAKE real.
Does this mean the dream "has happened"? It has not happened IN REALITY, but it HAS occurred within the context of the mind's freedom to dream. It doesn't have REALITY to it, but it IS something you are CAPABLE OF PRODUCING through mis-creation. And when you DO freely choose it, with your free will, it will become seemingly real to you because what you accept into your mind becomes your reality.
"To "change your mind" means to place it at the disposal of True authority. The miracle is thus a sign that the mind has elected to be guided by Christ in HIS service. The abundance of Christ is the natural result of choosing to follow him."
The mind has to ELECT (choose) to be under service to Christ. This IS a free-willed choice, not something forced upon you. God does not create slaves.
"Into eternity, where all is one, there crept a tiny mad idea"
There DID creep an idea, a thought, an imagining, into the mind, because IT COULD. The mind CAN DREAM. But the dream that it produces is not real or like God. Elsewhere Jesus refers to it as "an order of reality", meaning that you gave reality TO it to try to turn it into reality, through belief, but the belief is based on a false premise, so it is ultimately unfounded and fundamentally unreal at its core.
"Into eternity, where all is one, there crept a tiny mad idea", at which the Son of God remembered not to laugh. In his forgetting did the thought become a serious idea, and possible of both accomplishment and real effects. Together, we can laugh them BOTH away, and understand that time can NOT intrude upon eternity. It IS a joke to think that time can come to circumvent eternity, which MEANS there is no time."
I will leave you this statement by Jesus:
"The Separation HAS occurred. To deny this is merely to misuse denial. However, to concentrate on error is merely a further misuse of legitimate psychic mechanisms. The true corrective procedure, which has already been described as the proper use of the spiritual eye (or true vision), is to accept the error temporarily, BUT ONLY as an indication that IMMEDIATE correction is mandatory. This establishes a state of mind in which the Atonement can be accepted without delay."
What he means here, is not that the separation is REAL, but that in the MIND, it HAS OCCURRED as a thought, an idea, an IMAGINED possibility. There HAS been an attempt to usurp God's will. There HAS been a "dream". Not REALLY, but ... in the proper context, in the mind, this IS something that we CHOSE, something we TRIED TO MAKE REAL, something we tried to DO, to will it, to mis-create. We DID mis-create. That's the ONLY reason that you are able to be sitting there seeming to be a body reading this text right now. But the ultimate truth is, this is a dream, an unreality, it's ultimately based on a false foundation or premise - that there is an alternative to God's will, and because that is untrue, it is not REALLY REAL. So it hasn't REALLY happened in truth, in the biggest picture.
You DO, in a sense, dream a dream. But you CAN stop dreaming, by changing your mind. Dreaming is a state of MIND, of insanity, believing that time can replace eternity and space can replace God's presence. Effectively, there HAS been a "fall of man", but the fall is imaginary. It is ONLY an idea, but it IS an idea, not less than that. The "existence" of this idea, however, must be temporary, because it is an idea of being temporary, and is naturally limited and finite. It is therefore INEVITABLE that the dream will end and the IDEA - in which this entire physical universe dwells - will disappear.