The mathematician's patterns, like the painter's or the poet's must be beautiful; the ideas, like the colors or the words must fit together in a harmonious way. Beauty is the first test: there is no permanent place in this world for ugly mathematics.
Godfrey H. Hardy (1877 - 1947)
Source: A Mathematician's Apology, London, Cambridge University Press, 1941.
Contributed by: Zaady