Isaac Newton — "We are to admit no more causes of natural things than such as are both true and …"
We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.
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More from Isaac Newton
"If I am anything, which I highly doubt, it is due to hard work."
"The frame of nature, and the system of the world, we are to observe by the phenomena, and not to frame by imagination."
"For it is the property of true philosophy to deduce the causes of all natural effects from the simplest possible principles."
"The best and safest method of philosophizing seems to be, first to inquire diligently into the properties of things, and to establish those properties by experiments, and then to proceed more slowly t…"
"I have studied these things – you have not."
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Understanding this quote
What it means
Only invoke causes that are real and genuinely necessary to account for what you observe. Do not invent extra explanations when fewer will do. If one mechanism fully explains a phenomenon, adding more is dishonest and muddies understanding. It is science's economy principle: strip away speculative causes until only what the evidence demands remains. This makes theories testable, falsifiable, and honest—a foundation of modern scientific thinking.
Relevance to Isaac Newton
Newton lived this principle: his law of universal gravitation collapsed centuries of separate celestial and terrestrial theories into one cause—gravity. He famously refused to hypothesize beyond evidence ('Hypotheses non fingo'). His three laws of motion reduced endless mechanical complexity to bare essentials. Newton saw simplicity as revealing God's design. He distrusted Descartes' elaborate vortex theory precisely because it invented unnecessary mechanisms that evidence never demanded.
The era
The early modern era was escaping Aristotle's four causes and scholasticism's layered metaphysical explanations for natural events. Competing systems—Descartes' vortices, occult forces, spiritual intermediaries—cluttered natural philosophy with unverifiable causes. Newton wrote this rule in Principia (1687) to discipline a field drowning in speculation. The Royal Society's empiricist culture ('Nullius in verba') demanded evidence-grounded claims. Newton's parsimony rule became a cornerstone of what we now call the scientific method.
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