Whatever doubt might rise, he knew that he was right. But the rightness was an intellectual rightness and the… — Clifford D. Simak

This was the past and it was the dead past; there were only corpses in it—and perhaps not even corpses, but the shadows of those corpses. For the dead trees and the fence posts and the bridges and the buildings on the hill all would classify as shadows. There was no life here; the life was up ahead. Life must occupy but a single point in time, and as time moved forward, life moved with it. And so was gone, thought Blaine, any dream that Man might have ever held of visiting the past and living in the action and the thought and the viewpoint of men who’d long been dust. For the living past did not exist, nor did the human past except in the records of the past. The present was the only valid point for life—life kept moving on, keeping pace with the present, and once it had passed, all traces of it or its existences were carefully erased.

The red thought rose up inside Blaine’s brain: Why not kill him now?

For the killing would come easy. He was an easy man to hate. Not on principle alone, but personally, clear down to his guts.

There were certain basic things, perhaps—the very earth, itself—which existed through every point in time, holding a sort of limited eternity to provide a solid matrix. And the dead—the dead and fabricated—stayed in the past as ghosts. The fence posts and the wire strung on them, the dead trees, the farm buildings, and the bridge were shadows of the present persisting in the past. Persisting, perhaps, reluctantly, because since they had no life they could not move along. They were bound in time and stretched through time and they were long, long shadows.

He was, he realized with a shock, the only living thing existing in this moment on this earth. He and nothing else.