As cited in: Pierre Bayle, John Peter Bernard, John Lockman (1738), A general dictionary, historical and critical http://books.google.com/books?id=UWhZAAAAYAAJ&pg=PA783, p. 783;
Preface to View of Newton's Philosophy, (1728)
“He told me, he was just in the same situation [i. e. in a garden], as when formerly, the notion of gravitation came into his mind. It was occasion'd by the fall of an apple, as he sat in a contemplative mood. Why should that apple always descend perpendicularly to the ground, thought he to him self. Why should it not go sideways or upwards, but constantly to the earths centre? Assuredly, the reason is, that the earth draws it. There must be a drawing power in matter.”
A Hastings White (ed.) Memoirs of Sir Isaac Newton's Life (1936) pp. 19-20. (1752)
Relating a conversation with Sir Isaac Newton.
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William Stukeley 3
English antiquarian 1687–1765Related quotes

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“Why should man be afraid to think, and why should he fear to express his thoughts?”
Heretics and Heresies (1874)
Context: Why should man be afraid to think, and why should he fear to express his thoughts?
Is it possible that an infinite Deity is unwilling that a man should investigate the phenomena by which he is surrounded? Is it possible that a god delights in threatening and terrifying men? What glory, what honor and renown a god must win on such a field! The ocean raving at a drop; a star envious of a candle; the sun jealous of a fire-fly.

“when he smiles it's as if you'd just told him the first joke on earth.”
Source: Tuesdays with Morrie

As quoted by Robert Chambers, "Sir Isaac Newton and the Apple," The Book of Days (1832) Vol. 2 https://books.google.com/books?id=K0UJAAAAIAAJ, p. 757.