The too-perfect security of the Upper-worlders had led them to a slow movement of degeneration, to a general dwindling in size, strength, and intelligence.
 H. G. Wells, The Time Machine (1895). copy citation

Context

“My explanation may be absolutely wrong. I still think it is the most plausible one. But even on this supposition the balanced civilization that was at last attained must have long since passed its zenith, and was now far fallen into decay. The too-perfect security of the Upper-worlders had led them to a slow movement of degeneration, to a general dwindling in size, strength, and intelligence. That I could see clearly enough already. What had happened to the Under-grounders I did not yet suspect; but from what I had seen of the Morlocks—that, by the by, was the name by which these creatures were called—I could imagine that the modification of the human type was even far more profound than among the "Eloi," the beautiful race that I already knew.” source

Meaning and analysis

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