Medicine and morality being related to function and use are, therefore, inseparable in a Progressive State. The union between the physical, moral, and intellectual elements of our nature cannot be dissolved during lifetime. To speak of the ‘Physician of Nature’ and ‘Physician of Grace,’ as two entirely distinct classes is an untenable position or a misleading sophism. Sound education, State medicine, healthy society, must all be based upon the inseparable union of the various elements of the human constitution. This is the only rational system in a Progressive State; any other practice leads to empirical medicine and hypocritical morality. The unity of human nature gives immense importance to the influences which surround the beginning of life and the education of the young. The greatest present obstacle to progress is the ignorance of parents, and above all of mothers, of many facts of physiology, and particularly of the facts of sexual physiology. For want of this knowledge our nurseries and schools are not wisely guarded, young people lack guidance, and marriages are too often the mischievous union of two unsuitable partners. By the present lamentable ignorance of sound physiology, men and women lack the elements necessary for forming correct judgment on the most important relations of life. Parents are thus unequal to their first duty, viz., the guiding of domestic and social life, as helpmeets to one another. In all the excellent treatises on physiology, domestic economy and education, prepared for the special instruction and help of parents and teachers, all knowledge is generally omitted which refers to the sexual functions; yet to the parent or educator this is an essential branch of knowledge. A woman attempts to carry on her work blindfold, who tries to educate her children, guide her household, or take her proper part in society without this knowledge. She understands nothing that is going on around her; she sees nothing but the surface of things; her influence is either stupid, mischievous, or negative, if she is not truthfully instructed in relation to the central force of human emotion and action. Mothers, requiring this knowledge for their special duties which commence with infant life, can with propriety, purity, and reverence study the action and uses of our sexual powers. Their intense interest in the family and self-sacrificing devotion to its welfare, their insight into its needs, and their sensitive consciousness of the approach of danger to their offspring, make them the providentially appointed guardians of the young. The profound depth of the passion of maternity in women extends not only to the relations of marriage, but to all the weak or suffering wherever found. It gives a sacredness to the woman’s appreciation of sex, which has not yet been utilized for the improvement of the social life of the nation.