I accepted one branch of this philosophy, but eugenics without birth control seemed to me a house built upon sands. It could not stand against the furious winds of economic pressure which had buffeted into partial or total helplessness a tremendous proportion of the human race. The eugenists wanted to shift the birth control emphasis from less children for the poor to more children for the rich. We went back of that and sought first to stop the multiplication of the unfit. This appeared the most important and greatest step towards race betterment.

Chapter 30, "Now Is the Time for Converse", pp. 374-375. - Margaret Sanger: An Autobiography (1938)