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

Some cause happiness wherever they go; others, whenever they go. (Oscar Wilde)

Against stupidity, the gods themselves contend in vain. (Friedrich von Schiller)

A lie gets halfway around the world before the truth has a chance to get its pants on. (Sir Winston Churchill)