“Science, in the broadest sense, is simply that which may be verified; but how much of that which theology accepts and goes upon is verifiable by human reason or experience?”
Source: The Light of Day (1900), Ch. III: Science and Theology
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John Burroughs 41
American naturalist and essayist 1837–1921Related quotes

Source: The Light of Day (1900), Ch. III: Science and Theology

Introduction<!-- pp. 3-4 -->
The Idea of Progress: An Inquiry Into Its Origin and Growth (1921)
Context: Science has been advancing without interruption during the last three of four hundred years; every new discovery has led to new problems and new methods of solution, and opened up new fields for exploration. Hitherto men of science have not been compelled to halt, they have always found ways to advance further. But what assurance have we that they will not come up against impassable barriers?... Take biology or astronomy. How can we be sure that some day progress may not come to a dead pause, not because knowledge is exhausted, but because our resources for investigation are exhausted... It is an assumption, which cannot be verified, that we shall not reach a point in our knowledge of nature beyond which the human intellect is unqualified to pass.

“Science replaces private prejudice with publicly verifiable evidence.”
The Enemies of Reason, "The Irrational Health Service"
The Enemies of Reason (August 2007)

Testimony before the US Senate Committee on Environment and Public Works (28 September 2005)
Context: Science is nothing more than a method of inquiry. The method says an assertion is valid — and merits universal acceptance — only if it can be independently verified. The impersonal rigor of the method means it is utterly apolitical. A truth in science is verifiable whether you are black or white, male or female, old or young. It's verifiable whether you like the results of a study, or you don't.

The Ethics of Belief (1877), The Weight Of Authority

Ch 11. "The Demarcation between Science and Metaphysics." (Summary, p. 253)
Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

“The strongest argument proves nothing so long as the conclusions are not verified by experience.”
[H]aec vocatur scientia experimentalis, quae negligit argumenta, quoniam non certificant, quantumcunque sint fortia, nisi simul adsit experientia conclusionis. Et ideo haec docet experiri conclusiones nobiles omnium scientiarum, quae in aliis scientiis aut probantur per argumenta, aut investigantur per experientias naturales et imperfectas...
OQHI, 43 http://www.mlat.uzh.ch/MLS/text.php?tabelle=Rogerus_Baco_cps4&rumpfid=Rogerus_Baco_cps4,%20Opus%20tertium,%20%2013&level=3&corpus=4&lang=0¤t_title=Opus%20tertium&links=&inframe=1&hide_apparatus= as cited in: James J. Walsch (1911) """"Science at the Medieval Universities"""" in: Popular Science, May 1911, p. 449 http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_78.djvu/459
Opus Tertium, c. 1267
Context: The strongest argument proves nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences, and the goal of all speculation.