A Quote by Jules Henri Poincaré on assumptions, imagination, logic, machines, needs, and understanding
Thus, be it understood, to demonstrate a theorem, it is neither necessary nor even advantageous to know what it means. The geometer might be replaced by the "logic piano" imagined by Stanley Jevons; or, if you choose, a machine might be imagined where the assumptions were put in at one end, while the theorems came out at the other, like the legendary Chicago machine where the pigs go in alive and come out transformed into hams and sausages. No more than these machines need the mathematician know what he does.
Source: J. R. Newman (ed.) The World of Mathematics, New York: Simon and Schuster, 1956.
Contributed by: Zaady