The Man Who Awoke by Laurence Manning

Winters was silent. Bengue's words were plausible, but he suspected a good deal of what he said was due rather to imaginary than to actual improvements in the human animal during the last twenty thousand years. But there was some truth in them-enough to put Winters in a gloomy state of mind. Had he forsaken his own times and his own kind of people all for the sake of finding himself an unwanted guest in a future world of supermen? And if so, why go on still further into the future? Might the steady progress of evolution not change the face of the earth in the next five thousand years-make him still more ludicrous in the sight of the still further improved humans who were to come?

Bengue was looking at him surlily.