Only infinity of space and duration are possible, and yet we can't grasp them; still, they are the only possible states in which we can exist.

And now, as I have had a glimpse of the past, I wonder what this place would be like in ten thousand years?
"Good heavens, how cold it is!" He shivered, and buttoned up his coat, and continued, looking about him on the vast snow-field dotted with hummocks of ice which lay bleak and lifeless about him: "Ah, I suppose either the Gulf Stream has got diverted, or the earth's axis has shifted and we are in another glacial epoch.
"WE!" Again the shock of utter isolation struck him, but it seemed to hit him harder this time.

The world that he had been born in lay ten thousand years behind him.

For all he knew, he might be standing upon what was now the earth's North Pole.

Civilisation, as he had known it, might have been wiped off the face of the earth, and the remnants of humanity flung back into savagery.