"'Citizens,' we shall say to them in our tale--'You are
brothers, yet God has framed you differently. Some of you
have the power of command, and these he has composed of
gold, wherefore also they have the greatest honour; others
of silver, to be auxiliaries; others again, who are to be
husbandmen and craftsmen, he has made of brass and iron; and
the species will generally be preserved in the children. But
as you are of the same original family, a golden parent will
sometimes have a silver son, or a silver parent a golden son.
And God proclaims to the rulers, as a first principle, that
before all they should watch over their offspring, and see
what elements mingle with their nature; for if the son of a
golden or silver parent has an admixture of brass and iron,
then nature orders a transposition of ranks, and the eye of
the ruler must not be pitiful towards his child because he has
to descend in the scale and become a husbandman or artisan;
just as there may be others sprung from the artisan class, who
are raised to honour, and become guardians and auxiliaries.
For an oracle says that when a man of brass or iron guards the
State, it will then be destroyed.'"[1]

[Footnote 1: "The Dialogues of Plato." Translated into English, with
Analysis and Introduction, by B. Jowett, M.A. Vol. ii. p. 243.]

Time, whose tooth gnaws away everything else, is powerless against
truth; and the lapse of more than two thousand years has not weakened
the force of these wise words. Nor is it necessary that, as Plato
suggests, society should provide functionaries expressly charged with
the performance of the difficult duty of picking out the men of brass