I can't decide. It's either:

How can they be jamming us if they don't know we're coming? - from ROTJ
I always loved the scene. It's my favorite piece of score by Williams paired with that look of despair on Lando's face. Got goosebumps the first moment I saw it and still get them today.

or:

The Force is what gives a Jedi his power. It's an energy field created by all living things. It surrounds us and penetrates us. It binds the galaxy together. - from ANH
I just love to listen to Kenobi telling this. Guinness makes it so easy to forget that he is an actor.