Siobhan

Once is happenstance. Twice is coincidence. Three times is enemy action. (Auric Goldfinger, in Goldfinger by Ian L. Fleming)

The fundamental cause of trouble in the world is that the stupid are cocksure while the intelligent are full of doubt. (Bertrand Russell)

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