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" The lack of balance between the birth-rate of the "unfit" and the "fit," admittedly the greatest present menace to the civilization, can never be rectified by the inauguration of a cradle competition between these two classes. The example of the inferior classes, the fertility of the feeble-minded, the mentally defective, the poverty-stricken, should not be held up for emulation to the mentally and physically fit, and therefore less fertile, parents of the educated and well-to-do classes. On the contrary, the most urgent problem to-day is how to limit and discourage the over-fertility of the mentally and physically defective. "
― Margaret Sanger , The Pivot of Civilization