I. Bernard Cohen, Preface to Opticks by Sir Isaac Newton (1952)
“Newton's own motto, "hypotheses non fingo" was, in a sense, disregarded by Newton himself: he rejected hypotheses only where they violated his own "regula philosophandi", that is to say, his principle of their strict parsimony. In terms of present-day methodology, we reject hypotheses as scientifically meaningless if they are incapable even of indirect test; and we reject them as superfluous or as implausible if they are too complex and artificial to conform with well established canons of inductive probability. But freedom of scientific theorizing must be preserved wherever the conditions of meaningfulness and of economy appear to be satisfied.”
Arthur Beer (ed.), Vistas in Astronomy (1955) Introduction to Vol.1 https://ia600304.us.archive.org/35/items/VistasInAstronomy-Volume1/Beer-VistasInAstronomyVolume1.pdf
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Arthur Beer 1
German astronomer 1900–1980Related quotes
Introduction
Higher Mathematics for Chemical Students (1911)

Source: The Dragons of Eden (1977), Chapter 7, “Lovers and Madmen” (p. 193)

Source: 1850s, An Investigation of the Laws of Thought (1854), p. 375, as cited in: Lev D. Beklemishev (2000) Provability, Computability and Reflection, p. 432

“beliefs are hypotheses to be tested, not treasures to be guarded.”
[Philip Tetlock and Dan Gardner, Superforecasting: The Art and Science of Prediction, McClelland & Stewart, 2015, 078-0-7710-7052-5, 127]
Source: Systems Thinking, Systems Practice, 1981, p. 51 cited in: Rosário Macário (2011) Managing Urban Mobility Systems. p. 52

Source: Morals and Dogma of the Ancient and Accepted Scottish Rite of Freemasonry (1871), Ch. XXXII : Sublime Prince of the Royal Secret, p. 841
Context: All hypotheses scientifically probable are the last gleams of the twilight of knowledge, or its last shadows. Faith begins where Reason sinks exhausted. Beyond the human Reason is the Divine Reason, to our feebleness the great Absurdity, the Infinite Absurd, which confounds us and which we believe. For the Master, the Compass of Faith is above the Square of Reason; but both rest upon the Holy Scriptures and combine to form the Blazing Star of Truth.
All eyes do not see alike. Even the visible creation is not, for all who look upon it, of one form and one color. Our brain is a book printed within and without, and the two writings are, with all men, more or less confused.