I should consider that I know nothing about physics if I were able to explain only how things might be, and were unable to demonstrate that they could not be otherwise. For, having reduced physics to mathematics, the demonstration is now possible, and I think that I can do it within the small compass of my knowledge.
In: A.C. Crombie, Descartes, Scientific American, Volume 201, Number 4, October 1959 (p. 160)