"Entia non sunt multiplicanda praeter necessitatem."
Which is in Latin and in English it means: "No more things should be presumed to exist than are absolutely necessary." I seem to be collecting quotes from everywhere! This quote, it's from this excellent novel I'm reading by Mark Haddon, 'The curious incident of the dog in the night-time'. The book won the Whitbread award and if I was on the panel I'd give it to him, too. Great stuff! Keeps my mind occupied.