maybe newton?
yes it was Isaac newton... the law of gravity!
Only problem, of course, is that this is actually something that he conclusively disproved. If an object has a sufficiently high upward velocity, gravity, weakening evermore with increasing distance, will not be able to bring the object down. It will be in a 'hyperbolic' orbit.
In other words, it is popularly attributed to him, but it is unlikely that he said it.
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