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Being a scientist, Polanyi noticed a connection between the ideals of logical positivism and the nihilism of the left. Even today, despite the fact that positivism has been thoroughly discredited, it remains a kind of tacit metaphysic for both scientists and for much of the educated public. In other words, there is a widespread assumption that "only scienctific theories [are] capable of verification (i.e., proof), and that moral or ethical or political or religious ideals and principles [are] essentially unprovable, mere matters of emotional preference." But Polanyi saw that there was a deep relationship between the very possibility of science and certain metaphysical ideals and principles "that not only could not be proved, but could not even be made wholly explicit." And just because the ideals which underlie science could not be proved, it hardly meant that they were unworthy of belief.
This tacit acceptance of positivism ramifies in interesting ways. On the one hand, there is the scientific worker bee who supposedly only believes what his experimental data tell him. But this is indeed a cold, dead, airless, and ultimately infrahuman spiritual environment into which the passion for nihilism rushes to fill the void. In this regard, it seems that human nature abhors a vacuum, and therefore filled it with a void -- the nihilistic void of the secular left.
Now it is surely noteworthy that the only organized opposition to liberty comes from intellectuals, who supposedly hold their own liberty -- i.e., "academic freedom" -- to be sacred. How could someone who would instinctively rebel at the idea of centralized "planned culture," embrace the idea of a centralized, planned economy? ..."
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