Don't be overly suspicious where it's not warranted.
Don't believe everything you hear or anything you say.
Don't buy a landslide. I don't want to have to pay for one more vote than I have to. -- Joseph P. Kennedy, on JFK's election strategy.
Don't compare floating point numbers solely for equality.
Don't confuse things that need action with those that take care of themselves.
Don't cook tonight -- starve a rat today!
Don't crush that dwarf, hand me the pliers! -- Firesign Theatre
Don't despair; your ideal lover is waiting for you around the corner.
Don't despise your poor relations, they may become suddenly rich one day. -- Josh Billings
Don't do the crime, if you can't do the time. -- Lt. Col. Ollie North