My absolutely favorite quote:
"Parts left out cost nothing and have an infinite service life."
Chas. (Boss) Kettering
Chief Engineer General Motors
Tony Duell wrote:
 I believe that I.K. Brunell once said 'Any third-rate engineer can make a
 complicated device even more complicated. It takes a genius to go back to
 first principles'. From what I can see, there are a lot of 3rd-rate
 engineers out there at the moment.
 -tony