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Doubt is an element of criticism, and the tendency of criticism is necessarily skeptical.

Benjamin Disraeli (Earl of Beaconsfield) (1864). “Church policy: a speech delivered by the Right Hon. B. Disraeli, M.P. at a meeting of the Oxford Diocesan Society for the Augmentation of Small Livings, in the Sheldonian Theatre, Oxford, Nov. 25, 1864, etc”, p.17
Doubt is an element of criticism, and the tendency of criticism is necessarily skeptical.