What and How We Know and Reason & Logic
Reasoning Practically (Oxford University Press: 2000), p. 76.
Given my focus on practical rather than theoretical reasoning, I may at this point consider weakening the principle of total evidence and examining a presumption instead. The presumption to be examined establishes, for purposes of rational action, a generic bias in favor of more knowledge rather than on less. To defend the adoption of the presumption in favor of being maximally informed amounts to defending the belief that following it will lead, in the long run, to better overall results, in terms of goal fulfillment, than the results of following its antithesis (i.e., a presumption establishing a generic bias in favor of acting on the basis of less knowledge rather than on more), or indeed better than the results of a case-by-case balancing (i.e., of following no rule or presumption at all).
Proposed Roads to Freedom (H. Holt & Co.), p. 147.
What a man believes upon grossly insufficient evidence is an index to his desires — desires of which he himself is often unconscious. If a man is offered a fact which goes against his instincts, he will scrutinize it closely, and unless the evidence is overwhelming, he will refuse to believe it. If, on the other hand, he is offered something which affords a reason for acting in accordance with his instincts, he will accept it even on the slenderest evidence.