Birth control itself, often denounced as a violation of natural law, is nothing more or less than the facilitation of the process of weeding out the unfit, of preventing the birth of defectives or of those who will become defectives. So, in compliance with nature's working plan, we must permit womanhood its full development before we can expect of it efficient motherhood. If we are to make racial progress, this development of womanhood must precede motherhood in every individual woman.

Chapter 18, "The Goal" - Woman and the New Race, (1922)