The world to come, age to come, or heaven on Earth are eschatological phrases reflecting the belief that the current world or current age is flawed or cursed and will be replaced in the future by a better world or age or paradise. The concept is related but differs from the concepts of heaven, the afterlife, and the Kingdom of God in that heaven is another place or state generally seen as above the world, the afterlife is generally an individual's life after death, and the Kingdom of God could be in the present (such as Realized eschatology) or the future.
In Zoroastrian eschatology, the world to come is the frashokereti, where the saoshyant will bring about a resurrection of the dead in the bodies they had before they died. This is followed by a last judgment. The yazatas Airyaman and Atar will melt the metal in the hills and mountains, and the molten metal will then flow across the earth like a river. All mankind—both the living and the resurrected dead—will be required to wade through that river, but for the righteous (ashavan) it will seem to be a river of warm milk, while the wicked will be burned. The river will then flow down to hell, where it will annihilate Angra Mainyu and the last vestiges of wickedness in the universe.
I'm sitting by a lake
But it's not of this earth
The water is so clear
And the birds are alive
A mirror for the sky
They see themselves
And fly away
I'm sitting by a lake
The universe is alive
I lay down by the river-flow
It's a river of stars
I'm living by the ocean
It's an ocean of light
How do you call
This place around us
It's a world that I once saw
In a dream
Will you please tell me now
If I'm dead or alive
Landscapes so bright
All around
It's a city of light
Were who when and why ?
I think therefore I am
I feel like I know this land
But it must be so far awayâ¦
This world is life
This âclouds-and-wondersâ
Is all I need
And it will never go
You say it's lost
I don't believe it
This is my vision
We can never know
This is the earth
But ages after
I know the world
Will overcome its' pain
The simple fact
I dream about it
Already makes it
Happen in the rain
It's right in front
But you don't face it
I'm dedicated
All my life in me
And made of light
Our sun is growing
Like in the heart of some of us
I pray
And other lands
You will discover
This form of life
Is not the only one
I was a child
And I just knew it
And now I know