“Hypotheses non fingo.”

— Isaac Newton , book Philosophiae Naturalis Principia Mathematica

I frame no hypotheses.

A famous statement in the "General Scholium" of the third edition, indicating his belief that the law of universal gravitation was a fundamental empirical law, and that he proposed no hypotheses on how gravity could propagate.

Variant translation: I feign no hypotheses.

As translated by Alexandre Koyré (1956)

I have not as yet been able to discover the reason for these properties of gravity from phenomena, and I do not feign hypotheses. For whatever is not deduced from the phenomena must be called a hypothesis; and hypotheses, whether metaphysical or physical, or based on occult qualities, or mechanical, have no place in experimental philosophy. In this philosophy particular propositions are inferred from the phenomena, and afterwards rendered general by induction.

As translated by I. Bernard Cohen and Anne Whitman (1999)
Philosophiae Naturalis Principia Mathematica (1687)

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Isaac Newton 171

British physicist and mathematician and founder of modern c… 1643–1727

Arthur Beer (1900–1980) German astronomer

Arthur Beer (ed.), Vistas in Astronomy (1955) Introduction to Vol.1 https://ia600304.us.archive.org/35/items/VistasInAstronomy-Volume1/Beer-VistasInAstronomyVolume1.pdf

“Of the many references to Newton in 18th-century electrical writings only a small number were to the Principia, the greater part by far were to the Opticks. This was true not alone of the electrical writings but also in other fields of experimental enquiry…. [The Opticks] would allow the reader to roam, with great Newton as his guide, through the major unresolved problems of science and even the relation of the whole world of nature to Him who had created it…. in the Opticks Newton did not adopt the motto… —Hypotheses non fingo; I frame no hypotheses—but, so to speak, let himself go, allowing his imagination full reign and by far exceeding the bounds of experimental evidence.”

I. Bernard Cohen (1914–2003) American historian of science

I. Bernard Cohen, Preface to Opticks by Sir Isaac Newton (1952)

“When two hypotheses are possible, we provisionally choose that which our minds adjudge to be simpler, on the supposition that this is the more likely to lead in the direction of truth. It includes as a special case the principle of Occam's razor-entia non multiplicana praeter necessitatem.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“I frame no hypotheses.”
Hypotheses non fingo.

Isaac Newton book Philosophiae Naturalis Principia Mathematica

A famous statement in the "General Scholium" of the third edition, indicating his belief that the law of universal gravitation was a fundamental empirical law, and that he proposed no hypotheses on how gravity could propagate.

Variant: I feign no hypotheses. / As translated by Alexandre Koyré (1956)
Source: Philosophiæ Naturalis Principia Mathematica (1687)
Context: I have not as yet been able to discover the reason for these properties of gravity from phenomena, and I do not feign hypotheses. For whatever is not deduced from the phenomena must be called a hypothesis; and hypotheses, whether metaphysical or physical, or based on occult qualities, or mechanical, have no place in experimental philosophy. In this philosophy particular propositions are inferred from the phenomena, and afterwards rendered general by induction.

As translated by I. Bernard Cohen and Anne Whitman (1999)

“Certainly it is permitted to anyone to put forward whatever hypotheses he wishes, and to develop the logical consequences contained in those hypotheses.”

Giuseppe Peano (1858–1932) Italian mathematician

"Sui fondamenti della geometria" (1894), p. 141, as quoted in "The Mathematical Philosophy of Giuseppe Peano" by Hubert C. Kennedy, in Philosophy of Science Vol. 30, No. 3 (July 1963)
Context: Certainly it is permitted to anyone to put forward whatever hypotheses he wishes, and to develop the logical consequences contained in those hypotheses. But in order that this work merit the name of Geometry, it is necessary that these hypotheses or postulates express the result of the more simple and elementary observations of physical figures.