Watch your thoughts; they become words.
Watch your words; they become actions.
Watch your actions; they become habits.
Watch your habits; they become character.
Watch your character; it becomes your destiny.
-- Frank Outlaw
Interestingly enough, Frank Outlaw is probably not the person who said this. From a brief internet search, I gathered that (a) there are a bunch of Frank Outlaws out there, but none is particularly famous and (b) there’s no evidence that any of them actually said this. Nevertheless, it’s a good quote.