Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
(The Principia - Laws of Motion, 1687)

Isaac Newton

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If I have seen further it is by standing on the shoulders of giants.

Isaac Newton (Letter to Robert Hooke, 1676)

We build too many walls and not enough bridges.

Isaac Newton

Plato is my friend, Aristotle is my friend, but my greatest friend is truth.

Isaac Newton (Notes - Certain Philosophical Questions, 1664) 

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