Letter to John Randolph (1 December 1803), published in  The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904,  Vol. 109 http://files.libertyfund.org/files/806/0054-10_Bk.pdf, pp. 54 
1800s, First Presidential Administration (1801–1805)
                                    
“Although it is admitted that certain differences cannot be verified by experiment, we should not infer from this fact that they do not exist. …we are accused of having confused subjective inability with objective indeterminacy.”
The Philosophy of Space and Time (1928, tr. 1957)
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Hans Reichenbach 41
American philosopher 1891–1953Related quotes
                                        
                                        "The Profession of Poetry," Partisan Review (September/October 1950) [p. 166] 
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)
                                    
                                        
                                        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
                                    
Source: Science and the Unseen World (1929), Ch. IV, p.48-49
"Subjective and Objective," in Mortal Questions, Cambridge University Press, 1979, p. 196.
                                        
                                        volume I; lecture 22, "Algebra"; section 22-1, "Addition and multiplication"; p. 22-1 
The Feynman Lectures on Physics (1964)
                                    
Letter to Blumentritt (13 April 1887)
Knowing Yourself: The True in the False (1996)