Let the caveman who does not choose to accept the axiom of identity,
try to present his theory without using the concept of identity or
any concept derived from it -- let the anthropoid who does not choose
to accept the existence of nouns, try to devise a language without
nouns, adjectives, or verbs -- let the witch doctor who does not
choose to accept the validity of sensory perception, try to prove
it without using the data he obtained by sensory perception -- let
the head-hunter who does not choose to accept the validity of logic,
try to prove it without logic -- let the pygmy who proclaims that a
skyscraper needs no foundation after it reaches its fiftieth story,
yank the base from under his building, not yours -- let the cannibal
who snarls that the freedom of man's mind was needed to create an
industrial civilization, but is not needed to maintain it, be given
an arrowhead and a bearskin, not a university chair of economics.
-- John Galt