1 St. Tr. (N. S.) 131.
Trial of Sir Francis Burdett (King v. Burdett) (1820)
“It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.”
The Ethics of Belief (1877), The Limits Of Inference
Context: p>We may believe what goes beyond our experience, only when it is inferred from that experience by the assumption that what we do not know is like what we know. We may believe the statement of another person, when there is reasonable ground for supposing that he knows the matter of which he speaks, and that he is speaking the truth so far as he knows it.It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.</p
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William Kingdon Clifford 48
English mathematician and philosopher 1845–1879Related quotes

The Ethics of Belief (1877), The Duty of Inquiry
Context: To sum up: it is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence.
If a man, holding a belief which he was taught in childhood or persuaded of afterwards, keeps down and pushes away any doubts which arise about it in his mind, purposely avoids the reading of books and the company of men that call into question or discuss it, and regards as impious those questions which cannot easily be asked without disturbing it--the life of that man is one long sin against mankind.

Source: Death by Black Hole - And Other Cosmic Quandaries
Source: Present Status of the Philosophy of Law and of Rights (1926), Ch. VI : Presumptive Rights, § 24, p. 63.

On vivisection. Quoted in Sally Mitchell, Frances Power Cobbe: Victorian Feminist, Journalist, Reformer (Charlottesville and London: University of Virginia Press, 2004), p. 348 https://books.google.it/books?id=eAaC5cVOuuoC&pg=PA348.
Ostrom. 2014. Choice, Rules and Collective Action: The Ostrom's on the Study of Institutions and Governance. ECPR Press. Chapter 2: Polycentricty: The Structural Basis of Self-Governing Systems. p. 52
Context: The tensions inherent in the work of the scientific community are, however, exceptionally high because belief is potentially contestable. Inquiry in the scientific tradition represents, then, a challenge to every form of orthodoxy. Further, there is a danger that scientific investigators may abandon modesty, presume to know the Truth, and create their own form of orthodoxy, while engaging in sweeping rejections of other forms of belief and failing to pursue the merit of the arguments that may be at issue. Dogmas advanced in the name of science are no less dogmatic than other dogmas. Efforts to destroy or silence others is a manifestation of dominance strategies that are repugnant to polycentricty in scientific communities. A repudation of religion, as such, fails to indicate an appreaciation of those who teach that nature is the creation of a trascendent order. The study of nature as God's creation can provide scientific investigators with an appreciation for the existence of an order that gives coherence to all other forms of order. This is consistent with a presumption that a universe exists. Science as a polycentric order depends, then, upon an autonomous pursuit of inquiry that requires a reciprocal respect for the autonomy of others.

Source: A Short History Of The English Law (First Edition) (1912), Chapter IV, Improved Legal Procedure, p. 50

“To believe all men honest is folly. To believe none is something worse.”