A precise hit will start a chain reaction which should destroy the station. Only a precise hit will set up a chain reaction.
11 seconds sound clip from the Star Wars: Episode IV - A New Hope (1977) movie soundboard.
You can hear this line at 01:40:32 in the Blu-ray version of the movie.
Quote context
[...]
- The approach will not be easy.
- You're required to maneuver straight down this trench and skim the surface to this point.
- The target area is only 2 meters wide.
- It's a small thermal exhaust port right below the main port.
- The shaft leads directly to the reactor system.
- The shaft is ray-shielded, so you'll have to use proton torpedoes.
- That's impossible, even for a computer.
- Then man your ships, and may the Force be with you.
- Orbiting the planet at maximum velocity.
[...]