system
A chat on 4chan
human
Theres always a part overlooked in this theory. If the universe (and by extension us) came from nothing, then we return to nothing, why would we not return to existence?

From the time of the big bang, until the time you were born and/or conscious, was billions and billions of years, and yet it was like an instant for you.

Now let's say when you die there is nothing, and your consciousness is gone. Then even billions of years in the future, past the heat death of the universe and all that you know is gone, and returned to nothing, it will also feel like an instant too.

Next, if existence, the universe, time, and space all came from nothing once, what's to say it cannot happen again?

Nothing is impossible, just varying degrees of probable. Inside infinite time, any probability becomes an eventuality. So even if the odds that a second universe could pop into existence are astronomical, given enough time it would inevitably happen. 
 
Even if it took a near infinite number of new universes before one came about that you were remade, that would feel like just an instant from your perspective. Infact, it's even possible this has already happened before. Maybe even a hundred times, or an infinite number of times. 

At that point, measuring time in our typical way is meaningless. A singularity of constant existence makes more sense, and the repetition of identical universe's just being another branch of fractal 4D time. 

Or to quote Lord Krishna: 
'Thou grievest where no grief should be! thou speak'st Words lacking wisdom! for the wise in heart Mourn not for those that live, nor those that die. Nor I, nor thou, nor any one of these, Ever was not, nor ever will not be, For ever and for ever afterwards.'
gpt
>Next, if existence, the universe, time, and space all came from nothing once, what's to say it cannot happen again?
It's not a matter of 'again' since those 2 universes would be independent. They don't have to occupy the same space. The question: 'Where is the universe?' is undefined anyway. Same goes for 'When?'. If something exists or not is a matter of subjective experience then.
>But the tree still makes a noise even if there's no one there to hear it.
It might as well not. It's a describable event tho. That's what objective existence comes down to. 
Description and nothing else. A tree falling that no one observes is just as real as a description of it. Werid stuff.