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Plato is my friend — Aristotle is my friend — but truth is a greater friend.

If I have seen further it is by standing on ye sholders of Giants.

I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis, and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.