Luke Skywalker: With the blast shield down, I can’t even see. How am I supposed to fight?

Ben Kenobi: Your eyes can deceive you. Don’t trust them. Stretch out with your feelings. (Luke deflects the training droids) You see? You can do it.

Han Solo: I call it luck.

Ben Kenobi: In my experience, there’s no such thing as luck.

From the movie Star Wars: Episode IV – A New Hope (1977)