Mine is from an early 2000s film called Vanilla Sky.
“The sweet is never as sweet without the sour.”
Lieutenant Worf : [referring to Admiral Satie] I believed her. I, I helped her. I did not see what she was.
Captain Jean-Luc Picard : Mister Worf, villains who twirl their moustaches are easy to spot. Those who clothe themselves in good deeds are well camouflaged.
Lieutenant Worf : I think… after yesterday, people will not be so ready to trust her.
Captain Jean-Luc Picard : Maybe. But she, or someone like her, will always be with us, waiting for the right climate in which to flourish, spreading fear in the name of righteousness. Vigilance, Mister Worf - that is the price we have to continually pay.