By 'uncertain' knowledge, let me explain, I do not mean merely to distinguish what is known for certain from what is only probable. The game of roulette is not subject, in this sense, to uncertainty...The sense in which I am using the term is that in which the prospect of a European war is uncertain, or the price of copper and the rate of interest twenty years hence...About
these matters there is no scientific basis on which to form any calculable probability whatever. We simply do not know.
these matters there is no scientific basis on which to form any calculable probability whatever. We simply do not know.
- John Maynard Keynes (1937)
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