This chapter examines two theories which briefly stated as follows. The first is the theory that racial health necessitates the sterilization of the unfit. It concerned with sterilization has been formally condemned by the present Pope, but it is less obviously opposed to Christian ideals, and it is held by a fair number not merely of Christians, but of idealistic Christians. The second is the theory that some races are superior to others, whose members are incapable of rising to the highest levels possible to humanity. It is definitely anti-Christian, inconsistent with the views which St. Paul took in the First Epistle to the Corinthians. Both of those theories are based to a considerable extent on an analogy with the principles which are known to hold in the breeding of domestic animals. To dominate over human beings which find an outlet in war and in despotic forms of government has manifested itself to some extent in this campaign for sterilization.