[after Bashir tells the story of The Boy Who Cried Wolf]
Julian Bashir: The point is, if you lie all the time, nobody's going to believe you, even when you're telling the truth.
Elim Garak: Are you sure that's the point, doctor?
Julian Bashir: Of course. What else could it be?
Elim Garak: That you should never tell the same lie twice.