Something of another

Carriages without horses shall go,
And horrors fill the world with woe.
Around the earth thoughts shall fly,
In the twinkling of an unblinking eye.
Through deepest hills death shall ride,
And no horse or ass be by their side.
Under water men shall walk,
Shall ride and sleep and talk.
In the air men shall be seen,
In white and black and in between.
And in those horrific far off days,
There shall be one comforting phrase:
"Death only has power
Where fear rules your mind,
So be not afraid
In this day and time."