Most of the fundamental ideas of science are essentially simple,
and may, as a rule, be expressed in a language comprehensible to
everyone - Albert Einstein.

Pure mathematics is, in its way, the poetry of logical ideas.
Albert Einstein

The highest form of pure thought is in mathematics
Plato

Mathematics possesses not only truth, but also supreme beauty
Bertrand Russell

Film is one of the three universal languages, the other two:
mathematics and music
Frank Capra

Mathematics is the queen of the sciences
Carl Friedrich Gauss

Mathematics is a more powerful instrument of knowledge than any
other that has been bequeathed to us by human agency
Descartes

It is easier to square a circle that to get round a mathematican
de Morgan

It is impossible to be a mathematician without being a poet in soul
Sophia Kovalevskaya

Mathematics is the gate and key to the sciences
Roger Bacon

Math class is tough 
Barbie Doll 1992

Mathematics is not a spector sport

"I'm very good at integral and differential calculus, I know the 
scientific names of beings animalculous; in short, in matters 
vegetable, animal, and  mineral, I am the very model of the modern 
Major General."  -- W.S. Gilbert in the Pirates of Penzance

Mathematics -- the subtle fine art -- Jamie Byrnie Shaw

"Beauty is the first test: there is no permanent place in the world 
for ugly mathematics."
-- Godfrey Harold Hardy, A Mathematician's Apology (1940)

"Mathematics compares the most diverse phenomena and discovers the 
secret analogies that unite them."  -- Joseph Fourier 

"The deep study of nature is the most fruitful source of 
mathematical discoveries."  -- Jean-Baptist-Joseph Fourier 

I advise my students to listen carefully the moment they decide to 
take no more mathematics courses.  They might be able to hear the 
sound of closing doors. -- James Caballero