Nature does not count nor do integers occur in nature. Man made them all, integers and all the rest, Kronecker to the contrary notwithstanding. – Percy William Bridgman, The Way Things Are

Although I am almost illiterate mathematically, I grasped very early in life that any one who can count to ten can count upward indefinitely if he is fool enough to do so. – Robertson Davies, "Of the Conservation of Youth," The Table Talk of Samu

With my full philosophical rucksack I can only climb slowly up the mountain of mathematics. – Ludwig Wittgenstein, Culture and Value