Each problem that I solved became a rule which served afterwards to solve other problems. (Rene Descartes, Discours de la Methode)

Not everything that can be counted counts, and not everything that counts can be counted. (Albert Einstein)

Facts are the enemy of truth. (Don Quixote – Man of La Mancha)

A friendship founded on business is better than a business founded on friendship. (John D. Rockefeller)