From Star Wars: Episode IV - A New Hope
What of the Rebellion? If the Rebels have obtained a complete technical reading of this station, it is possible, however unlikely, they might find a weakness and exploit it.
The plans you refer to will soon be back in our hands.
Any attack made by the Rebels against this station would be a useless gesture, no matter what technical data they have obtained. This station is now the ultimate power in the universe! I suggest we use it!
Don't be too proud of this technological terror you've constructed. The ability to destroy a planet is insignificant next to the power of the Force.