Here are a few of my favs...
“If you only knew the magnificence of 3, 6, and 9, then you would have a key to the universe” Nikola Tesla
“Those that cannot remember the past are condemned to repeat it” George Santayana. And a Corollary:
“Those who do not learn from history are doomed to repeat it”. Edmond Burke
On the Lighter side:
“Stupid is as Stupid does...”. Forrest Gump
“Beam me up Scotty, there’s no intelligent life down here”. Capt. James T Kirk
“Careful man there’s a beverage here!” Jeffrey Lebowski
For foreign relations enthusiasts:
“Doveryai, no proveryai”. Russian Proverb used by a once famous Hollywood Actor