If you ask ... the man in the street ... the human significance of mathematics, the answer of the world will be, that mathematics has given mankind a metrical and computatory art essential to the effective conduct of daily life, that mathematics admits of countless applications in engineering and the natural sciences, and finally that mathematics is a most excellent instrumentality for giving mental discipline... [A mathematician will add] that mathematics is the exact science, the science of exact thought or of rigorous thinking.
Cassius Jackson KeyserMathematics is, in many ways, the most precious response that the human spirit has made to the call of the infinite.
Cassius Jackson KeyserMathematics, even in its present and most abstract state, is not detached from life. It is just the ideal handling of the problems of life.
Cassius Jackson Keyser