Henri Poincare Quotes about Mathematics
One geometry cannot be more true than another; it can only be more convenient.
Henri Poincare (2012). “The Value of Science: Essential Writings of Henri Poincare”, p.85, Modern Library
"Thermodynamique: Leçons professées pendant le premier semestre 1888 - 1889". Preface to the book by Henri Poincare, 1892.