I like Oppenheimer's (father or the atomic bomb):
"Now I am become Death, the destroyer of worlds”
-from the Hindu scripture, the Bhagavad-Gita
"Oh, 'tanstaafl.' Means ~There ain't no such thing as a free lunch.' And isn't," I added, pointing to a FREE LUNCH sign across room, "or these drinks would cost half as much. Was reminding her that anything free costs twice as much in long run or turns out worthless."
"An interesting philosophy."
"Not philosophy, fact. One way or other, what you get, you pay for."