Hermann Weyl Quote

It is impossible to discuss realism in logic without drawing in the empirical sciences... A truly realistic mathematics should be conceived, in line with physics, as a branch of the theoretical construction of the one real world and should adopt the same sober and cautious attitude toward hypothetic extensions of its foundation as is exhibited by physics.

Philosophy of Mathematics and Natural Science (ed. Princeton University Press, 2009) - ISBN: 9780691141206