Some civilizations went your route and failed, others succeeded Future isn't set

[inavalan]

"Now I am going to say good evening shortly but remember you call this your universe and your reality and it is indeed, for you form it, and yet within you is also the knowledge of other great experiments that are being tried. And other probable systems are aware of the experiments that you are trying, and in your terms and I am speaking now in your terms only which to some extent means that I am hedging the fence, other civilizations have gone your route, some have failed. In your terms, the inhabitants of some earths, however, have succeeded very well and your future, in your terms, is not set."
—ECS3 ESP Class Session, February 16, 1971

[inavalan]

"You are presently within one system of reality, one probable reality, the reality that you now know and form physically. Now within that one reality you have reincarnational selves, they belong within the concept of that existence. All probable systems do not have reincarnational existences. Some do and some do not, so that these exist only here, as far as you are concerned for the moment.

And I know I am only going to confuse you but if you have probable selves then you know there are probable universes and probable earths and probable histories of your earth and you see what this is going to do to your concept of reincarnation as you now hold it. So within the system that you know, you also have probable reincarnational selves within those probable historical earths. Now this does nothing to deny the basic integrity nor validity of what you may prefer to call the soul. It simply means that the inner self also is far more creative, far richer, and far varied and much different than you originally supposed."
—ECS3 ESP Class Session, February 16, 1971