Is it possible to accept the world?
First of all, we have to keep in mind that we have perception, and our perception of the world is going to change depending on our mindset. This renders the world not really a "static" objective thing. So as we attempt to be more accepting, most likely our perception is going to change, and it's going to show us something different about the world we were trying to accept.
Secondly, Jesus says that "whatever you accept into your mind you make real to you". So if we are accepting something into our mind, that's going to seem real. We seemingly need to be careful about what we accept, otherwise we could inadvertently make something real to us that isn't.
So if we're trying to be more accepting, we have to look at a willingness to let go. This means letting go of various aspects of ego false perception. Such as resistance, control, denial, unwillingness, unawareness, blockages, trying to change things, not wanting things to be a certain way, a need to fix, etc. Let's say that we make progress towards relinquishing a lot of this ego activity. What then happens to acceptance?
If we resist and deny the world less, as though we are becoming "more accepting of" the world, allowing it to be whatever it is, this should lift away from our mind various resistance and darkness, allowing us to see the world more fully and accurately. Being more accepting or allowing of the world should put us in a more spiritual mindset. Our perception should become truer and more whole, more encompassing, more inclusive. The exclusivity, narrowness, selfishness and control should diminish.
But this also is going to mean that how we see the world - the world we're trying to accept - is going to change. We will see less of what we were making of it, in our resistance, and more of its "true nature". In a way, this will seem like opening up to simply allowing the world to be whatever way "it is". As if to suggest, we are becoming completely passive in simply observing it. Neutral. But we have to be careful here.
We don't want to be accepting into our mind that the world is real. We don't want to be believing "something really bad is happening" and to then try to accept it. This is the same as making something real and not being able to forgive it. Maybe it's useful to equate acceptance with forgiveness. To properly accept the world for "whatever it is", we must be forgiving of it. Which means OVERLOOKING whatever it is and not making it real.
So perhaps we need a new definition of acceptance, just as the course introduces a new definition of forgiveness. If the old forgiveness was to believe things are real and to pardon then, not really undoing anything, the new forgiveness recognizes this is just a dream world where nothing is really happening and you should not make any of it real to you. Similarly, the old acceptance said "accept whatever seems to be happening", which accepts into your mind unreal things that aren't happening. The new acceptance should say, accept the truth about this world, that this world is not real or happening, allow it to be an illusion of nothing, accept that it isn't there, and don't fight with illusions.
You can accept the truth about the world without having to make it real and accept bad stuff. If you're experiencing it as bad stuff it's because you're not accepting it. As you go to accept "the bad stuff" the bad stuff should stop looking like bad stuff. Less resistance should make the world less real, not merely leave you at the same place you were before. Less denial should make the world less solid to you Jesus even says in the course that if you have more guilt in your mind it will make the world seem more solid - so having less guilt should make the world more transparent.
You really then cannot accept the world. You can accept that it is not a world. This is the atonement. You can accept that nothing happened. You can accept God. But you cannot really accept what isn't even there to accept. But if you use that fact to try to resist or deny or make real the illusory world prior to accepting, you're just going to accept things which aren't true.
I could accept that the tree is burning, but if I try to be at peace while believing this is true, it will be impossible. If I can recognize the tree is not really burning, trees and fire are not real, I am now accepting reality and truth, and this is acceptable. The burning tree is now recognized as an illusion of a burning tree, a mere figment in a dream, which I don't have to accept "as real", only to accept its "true nature". It's true nature is that it's part of an illusion and nothing to be concerned about. Accepting the "real world" allows you to not be disturbed by the unreal content.
You can only truly accept what true perception shows you about the world. A forgiven world can be seen as forgiven (overlooked). You can accept the holy spirit's view of it, which correctly identifies that it is unreal. But trying to accept the unreal world, the illusory world, as if it's real, will never work. There is no peace where illusions are real. You can't be at peace while believing something real is dying. But you can be at peace by recognizing and accepting that nothing real can ever die, so whatever seems to die isn't really there TO accept.
Then you need not resist the illusory world, or deny it, or hide from it, or make it real, but nor do you need to accept it as though it's something to be accepted. Being neutral it is nothing, asking neither for acceptance or denial. Only God can be accepted, everything else is unacceptable.