Famous Quotes and laws of reality...

Those who watch the recent activity page will know that sometimes I post famous quotes and "laws" of reality but as not everyone even knows the activity page exists I decided to make it a thread... besides I'd like to read your favorite famous quotes and "laws" as well :) Just to start these were my last three posts:

If a straight line of holes is made in a piece of paper, such as a sheet of stamps or a check, that line becomes the strongest part of the paper. -- Kington's Law of Perforation

We can't solve problems by using the same kind of thinking we used when we created them. -- Albert Einstein (1879-1955)

The future is something which everyone reaches at the rate of sixty minutes an hour, whatever he does, whoever he is. -- C. S. Lewis