Luke tumbles over as the "seeker" robot hits him in the leg
during lightsaber practice.
HAN: Hokey religions and ancient weapons are no match for a good
blaster at your side, kid. 
LUKE: You don't believe in the Force, do you?
HAN: Kid, I've flown from one side of this galaxy to the other.
I've seen a lot of strange stuff, but I've never seen anything to
make me believe there's one all-powerful force controlling
everything. There's no mystical energy field that controls my
destiny.
BEN: 
HAN: It's all a lot of simple tricks and nonsense.