GRAVITATION, n. The tendency of all bodies to approach one another with a strength proportion to the quantity of matter they contain— the quantity of matter they contain being ascertained by the strength of their tendency to approach one another. This is a lovely and edifying illustration of how science, having made A the proof of B, makes B the proof of A.
(Ambrose Bierce: The Devil's Dictionary)
"A phenomenon is subject to analysis only if the structure of its events, as in this case, conforms to a regular pattern. Science progresses by discovering the connection between one phenomenon and other phenomena, and this is exactly what I succeeded in doing. If I were to ask you why a rock falls when dropped, you would reply that it is due to the action of gravity. Yet if I asked what gravity is, there would be no answer. But even though we don't know what gravity is, we can determine its regular pattern of action."
(Stanislaw Lem: The Investigation)
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