Course my favorite movie line of all time is "Charlie don't surf"
From Catch-22: Our strength is our weakness, their weakness is their strength!
Many Scriptural quotes: Don't muzzle the ox"
John 3:17 because it doesn't start with 'except'...
One from Aurelius Maximus, I believe is notable. it refers to the classic nature of new political leaders to invoke change to bring about great things, when all it tends to do is obfuscate the obvious....I don't remember it, but always wish to find it when I need it.