To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection. (Note: This quote, although found in the 1985 sci-fi novel, 'Lucifer's Hammer', by Larry Niven and Jerry Pournelle, may be erroneously attributed to Pournelle. As this quote can also be found in the Preface of Henri Poincare's "Science and Hypothesis" the 1952 Dover abridged edition)