While modern social conditions are removing the crude physical checks which the unrestrained struggle for existence places on the over-fertility of the unfit, they may at the same time be leading to a lessened relative fertility in those physically and mentally fitter stocks, from which the bulk of our leaders have hitherto been drawn.

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Quote text and notes from Wikiquote: Karl Pearson (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.