What's the most memorable quote whether from TV or somewhere else that has stuck with you to this very day?

For me, it's Buffy the Vampire Slayer quote,

"Seize the moment, because tomorrow you might be dead."


I've lost so many people in my life that died before 30. So this quote definitely has stuck with me and made me want to take every opportunity that I can.
What's the most memorable quote whether from TV or somewhere else that has stuck with you to this very day?
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