Isaac Newton — "The frame of nature, and the system of the world, we are to observe by the pheno…"
The frame of nature, and the system of the world, we are to observe by the phenomena, and not to frame by imagination.
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More from Isaac Newton
"He that in the study of natural philosophy shall resolve to proceed upon nothing but demonstrations and sound knowledge, hath a very large field of materials of all sorts to divert and employ him."
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Understanding this quote
What it means
Understanding nature and the cosmos demands direct observation of what actually happens—phenomena—not imagined explanations invented to seem logical. Science must start with evidence, not clever theories built from assumptions. We observe the world as it is, gather data, and let reality tell us its rules. Any system we build to describe nature must answer to what we actually see, not to what we find intellectually satisfying or intuitively pleasing.
Relevance to Isaac Newton
Newton's entire career embodied this principle. His Principia Mathematica drew on observed planetary data from Kepler and Galileo, not philosophical assertions. He famously declared 'hypotheses non fingo'—I frame no hypotheses—refusing to speculate on gravity's cause beyond describing its mathematics. His optics work relied on prisms and real light. He rejected Descartes' vortex theory of planetary motion precisely because it was imagination dressed as explanation, unsupported by observation.
The era
In Newton's 17th-century Europe, natural philosophy was split between Aristotelian scholasticism taught in universities and Cartesian rationalism, which built elaborate mechanical systems through pure reasoning. Descartes explained planetary orbits using imaginary vortices of invisible matter—no experiment required. The Royal Society, founded 1660, championed 'nullius in verba'—take nobody's word for it. Newton's empirical insistence was a decisive break from century-old habits of reasoning from first principles rather than from observed data.
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