Earlier quoted context omitted.
I'm confused, because that seems backwards to me? How can He exist within time and space if He created the universe (including time and space)?
The conclusion we came to is that such a being would have to have it's own, metaphysically superior, time and space, and our time would be a subtime of it as well as our space would be a subspace of it. The concept of a being subject to causality presupposes something akin to time.
And conscious matter creates universes constantly, that appear out of the void, hence creating time and space. This would also imply that its possible not only to change the future, but also the past.
The masters advise, however, that these are distractions and that the journey inevitably leads to experiencing the void itself, hence stepping out of time and space, and consciously experiencing any aspect of time and space and consciousness one wishes to, while always remembering that one is beyond it.