Why We Love Stories About Sparta

With key Greek city-states in submission, Philip of Macedon turned his attention to Sparta and sent a message: "If I win this war, you will be slaves forever."

In another version, Philip proclaims: "You are advised to submit without further delay, for if I bring my army into your land, I will destroy your farms, slay your people, and raze your city."

The Spartan ephors sent back a one word reply: "If."

(from here)