The guardians are instructed to examine the children in order to discover of what metals they are made. Plato admitted a democracy of talent in the sense that talent is likely to appear in the children of brass and iron parents, while gold parents may beget brass and iron children. If a gold child is found among the children of the artisans, he is to be encouraged and trained to become a guardian. If a brass and iron child is found among the children of the gold parents, he must descend the social scale and be trained for husbandry or artisanship.[V-32] Plato foresaw the fact, now scientifically established, that geniuses are born indiscriminately among all classes of society from the highest to the lowest. They are just as likely to be born in the hovel or overcrowded tenement as in the spacious and luxuriant palace. Consequently, society should seek out potential genius and give it opportunities commensurate with its possibilities and not allow its dynamic and divine spark to be snuffed out in a heavy-laden tenement atmosphere. Furthermore, according to Plato, the guardians are to seek out the imperfect children and put them out of the way as easily as possible and without attracting public attention.[V-33] If the capable must devote their energies to the care of imperfect children, they would presumably be wasting their ability and would be prevented from devoting themselves to upbuilding the state. This doctrine neglects the consideration of the harsh, unsympathetic attitude which it would engender. Although rigorously eugenic, the doctrine is undemocratic, unchivalric, and unChristian. It is thoroughly aristocratic. The guardians are to supervise marriage. Plato especially deplores the fact that almost all persons choose their life-partners in marriage without proper regard to the kind of children that will be procreated.[V-34] The marriage relationship should not be primarily an individual affair, but should be governed by the thought of the children that are not yet born and by due regard to the welfare of the state and society.[V-35] The true purpose of marriage is not found in wealth or power or rank, but in the procreation of healthy minded children. Marriage is sacred in the highest degree because it is socially necessary. Plato deplores class marriages, that is, marriage within temperamentally similar groups. Persons of gentle nature seek persons of gentle nature; the courageous seek the courageous. It would be better if the gentle would seek the courageous in marriage, and vice versa.[V-36] Marriage is sacred, and hence should be subjected to strict eugenic safeguards.