Math is like love -- a simple idea but it can get complicated.
— R. Drabek

Mathematicians do not study objects, but relations between objects.
— Henri Poincare

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
— Albert Einstein

One has to be able to count if only so that at fifty one doesn't marry a girl of twenty.
— Maxim Gorky

Mathematics is the music of reason.
— James Joseph Sylvester