Isaac Newton — "I do not define time, space, place, and motion, as being well known to all."

I do not define time, space, place, and motion, as being well known to all.
Isaac Newton — Isaac Newton Early Modern · Laws of motion and gravity

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Philosophiæ Naturalis Principia Mathematica

Date: 1687

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Understanding this quote

What it means

Newton is acknowledging that time, space, place, and motion are concepts everyone grasps from daily experience, so he won't formally define them from scratch. Yet this sets up his revolutionary distinction between absolute and relative forms of each — absolute time flows uniformly regardless of anything external, absolute space exists independently of matter. He's building rigorous mathematics on top of intuitions people already hold, without getting tangled in philosophical definitions.

Relevance to Isaac Newton

This comes from the opening Scholium of Newton's Principia Mathematica (1687), his masterwork on mechanics. Trained in natural philosophy and mathematics at Cambridge, Newton habitually grounded revolutionary ideas in seemingly familiar concepts. His genius was taking 'obvious' notions and mathematizing them precisely. It reflects his careful, methodical character — he famously declared 'hypotheses non fingo,' refusing to speculate beyond evidence, yet built a rigorous framework governing the entire universe from basic observable foundations.

The era

In the 17th century, natural philosophy was transitioning from Aristotelian categories to mathematical description. Before Newton, time and space were contested concepts debated by Descartes, Leibniz, and others. England's Royal Society, founded 1660, elevated experiment over scholasticism. Fierce debates raged about whether space was absolute or relational. Newton's careful framing — treating these concepts as already understood while secretly redefining them mathematically — was both strategically and intellectually shrewd given these unresolved controversies.

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