"You should truly give as you have truly received. The Golden Rule can work effectively only on this basis. "
"...This is the opposite of the Golden Rule, and having placed this rule upside down, the reverse of miracles, or projection, follows automatically.)"
The Golden Rule is simply based on the fact that God creates in his own likeness. The sons he create are all identical to each other and are identical in nature to God. Being identical is what "being one" means.
This means that what applies to one son, applies to all sons. And what applies to any son, also applies to God. The same rules apply equally to all of God's creations, who are all treated equally with unconditional love.
This sets up God's "law" - the Golden Rule - that quite literally, whatever applies to you, applies to others, at all times.
The Golden Rule is always in effect because it is always true. It is even in effect when you go into ego denial and pretend that it doesn't apply.
For example, everything to do with the ego is the denial of the Golden Rule, in which it asserts something different applies to you than applies to others. The ego is the idea of "being different", which is the same thing as specialness.
Being different is of the ego. Being identical is of the soul.
When something seems to apply to one and not another, this sets up the ego's murderous thought system. This means that you believe there is a separation between cause (God) and effect (Sons). Therefore you believe you can cause without experiencing effects, or that there is a separation between giving and receiving. That the Golden Rule does not apply.
This belief is murderous because it means you are attempting to cause someone (who is really your equal), to produce effects in them, while being separated off from those effects, thus "getting way with" murder. This is why "what is not love is murder."
The Golden Rule is always applying, no matter where you are. Even in the dream. Even as the ego attempts to *pretend* that the Golden Rule is not applying, it is applying. And it thus suffers the consequences, because DENIAL of the law does not circumvent it.
That means that, for example, if you attempt to treat a specific brother in a way that is different to others, you are in denial of the law, and MUST experience that how you treat them you are treating yourself. But you will pretend that you are able to treat them a certain way while escaping the consequences. Yet you will NOT escape the consequences.
It is not just a matter of IF you do unto others they will do unto you. Nor is it an optional matter of "treat others as you would have them treat you". Others may not seem to comply or reciprocate. The fact is, you cannot NOT do this. As you treat others, you ARE treating yourself. Directly.
Acknowledgement of the Golden Rule also acknowledges the secret to salvation, that you are doing it to yourself. However you try to see or treat others, you will treat yourself, and so you are hurting yourself when you try to hurt another. And anything they seemed to do to you, you must've done to yourself, because everything is shared equally.
Being in denial of the law does not cause you to escape the law. You can never be outside of the Golden Rule. It is God's law. It is firmly rooted in reality. If you pretend that it doesn't apply to you, it STILL will apply and then you will likely hurt yourself.
Trying to deny the law and act as if it isn't operating, you will do something to others that you think you can get away with, but instead indirectly hurt yourself. You may not realize that you hurt yourself, but you do. Trying to deny the law leads to "karma", or rather, self-inflicted attack. All attack is self attack.
The only way to be happy is to comply with the law. When you do this, the law is really on your side. It treats you well, because it recognizes that you deserve to be treated just as equally as everyone else. It recognizes your divine equality with all beings and that you deserve to be loved UNCONDITIONALLY and fully at all times.
When you operating in alignment with the Golden Rule you are perfectly safe, perfectly loved, perfectly empowered and free from all suffering. It is the recognition that you are as God created you and that all brothers are your perfect equals.
"Healing is an act of thought by which two minds perceive their oneness, and become glad."
You will be glad to recognize that what applies to you applies to your brother. You will be glad to recognize that the TWO of you are identical, and that each of you is equally treated with the same love by God. And you will be glad to see that you both SHARE everything together and have been given EACH OTHER to share WITH each other, that you not be alone, because God does not will to be alone.
And in that identicality, you are "one" - of one kind - with each other, and so recognize and know your brother as yourself.
The Golden Rule is littered throughout A Course in Miracles. It's embedded into and lays the foundation for so many concepts and ways of relating to others. The way that as you treat your brother you treat yourself. Your use of your body to demonstrate to your brother what you think of him. The sharing of minds. Seeing your oneness in him. It's all based on this fundamental principle, to love your brother as yourself.