I frame no hypotheses; for whatever is not deduced from the phenomena is to be called an hypothesis; and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.
(Letter to Robert Hooke, 1676)

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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