"Learn then from this story not to fear the fruits of the past, but rather to circumspect in the future, that those foul passions whereby our family has suffered so grievously may not again be loosed to our undoing." (actually from the Hound of the Baskervilles by Sir Arthur Conan Doyle)

"Entia non sunt multiplicanda praeter necessitatem." (Latin for: No more things should be presumed to exist than are absolutely necessary.)

"I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them."