It has generally been assumed that of two opposing systems of philosophy, e.g., realism and idealism, one only can be true and one must be false; and so philosophers have been hopelessly divided on the question, which is the true one.

Rational science treats its credit notes as always redeemable on demand while non-rational authoritarianism regards the demand for the redemption of its paper as a disloyal lack of faith. From his work Reason and Nature:
To be sure the vast majority of people who are untrained can accept the results of science only on authority.

Cohen. He was father to Felix S. Morris Raphael Cohen (July 25 1880 – January 28 1947) was an American philosopher lawyer and legal scholar who united pragmatism with logical positivism and linguistic analysis.