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[O]ut of the hurly-burly of events in time and space we extract changeless formulas whose chaste abstraction soars above all reference to any 'where' or 'when,' and thereby renders them blank cheques to be filled up at our pleasure with any figures of the sort. The only question isβWill Nature honour the cheque? Audentes Natura juvatβlet us take our life in our hands and try! If we fail, our blood will be on our own hands (or, more probably, in some one else's stomach), but though we fail, we are in no worse case than those who dared not postulate... Our assumption, therefore, is at least a methodological necessity; it may turn out to be (or be near) a fundamental fact in nature [an axiom].
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