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danger of his life: “If they could lay hands on [such a] man . . . they would kill him,” Plato says
in the last sentence of the cave allegory. The Platonic conflict between truthteller and citizens
cannot be explained by the Latin adage, or any of the later theories that, implicitly or explicitly,
justify lying, among other transgressions, if the survival of the city is at stake. No enemy is
mentioned in Plato’s story; the many live peacefully in their cave among themselves, mere
spectators of images, involved in no action and hence threatened by nobody. The members of
this community have no reason whatever to regard truth and truthtellers as their worst enemies,
and Plato offers no explanation of their perverse love of deception and falsehood. If we could
confront him with one of his late colleagues in political philosophy – namely, with Hobbes, who
held that only “such truth, as opposeth no man’s profit, nor pleasure, is to all men welcome” (an
obvious statement, which, however, he thought important enough to end his Leviathan with) – he
might agree about profit and pleasure but not with the assertion that there existed any kind of
truth welcome to all men. Hobbes, but not Plato, consoled himself with the existence of
indifferent truth, with “subjects” about which “men care not” – e.g., with mathematical truth,
“the doctrine of lines and figures” that “crosses no man’s ambition, profit or lust.” For, Hobbes
wrote, “I doubt not, but if it had been a thing contrary to any man’s right of dominion, or to the
interest of men that have dominion, that the three angles of a triangle should be equal to two
angles of a square; the doctrine should have been, if not disputed, yet by the burning of all books
of geometry, suppressed, as far as he whom it concerned was able.”
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No doubt, there is a
decisive difference between Hobbes’ mathematical axiom and the true standard for human
conduct that Plato’s philosopher is supposed to bring back from his journey into the sky of ideas,
although Plato, who believed that mathematical truth opened the eyes of the mind to all truths,
was not aware of it. Hobbes’ example strikes us as relatively harmless; we are inclined to assume
that the human mind will always be able to reproduce such axiomatic statements as “the three
angles of a triangle should be equal to two angles of a square,” and we conclude that “the
burning of all books of geometry” would not be radically effective.The danger would be
considerably greater with respect to scientific statements; had history taken a different turn, the
whole modern scientific development from Galileo to Einstein might not have come to pass. And
certainly the most vulnerable truth of this kind would be those highly differentiated and always
unique thought trains – of which Plato’s doctrine of ideas is an eminent example – whereby men,
since time immemorial, have tried to think rationally beyond the limits of human knowledge.
The modern age, which believes that truth is neither given to nor disclosed to but produced by
the human mind, has assigned, since Leibniz, mathematical, scientific, and philosophical truths
to the common species of rational truth as distinguished from factual truth. I shall use this
distinction for the sake of convenience without discussing its intrinsic legitimacy. Wanting to
find out what injury political power is capable of inflicting upon truth, we look into these matters
for political rather than philosophical reasons, and hence can afford to disregard the question of
what truth is, and be content to take the word in the sense in which men commonly understand it.
And if we now think of factual truths – of such modest verities as the role during the Russian
Revolution of a man by the name of Trotsky, who appears in none of the Soviet Russian history
books – we at once become aware of how much more vulnerable they are than all the kinds of
rational truth taken together. Moreover, since facts and events – the invariable outcome of men
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"Ch. 11. Hobbes, Leviathan, (eds. R. Tuck, R. Geuss, and Q. Skinner, (Cambridge: Cambridge University Press, 1996).)
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