Terence Mann: Ray, people will come Ray. They'll come to Iowa for reasons they can't even fathom. They'll turn up your driveway not knowing for sure why they're doing it. They'll arrive at your door as innocent as children, longing for the past. Of course, we won't mind if you look around, you'll say. It's only $20 per person. They'll pass over the money without even thinking about it: for it is money they have and peace they lack. And they'll walk out to the bleachers; sit in shirtsleeves on a perfect afternoon. They'll find they have reserved seats somewhere along one of the baselines, where they sat when they were children and cheered their heroes. And they'll watch the game and it'll be as if they dipped themselves in magic waters. The memories will be so thick they'll have to brush them away from their faces. People will come Ray. The one constant through all the years, Ray, has been baseball. America has rolled by like an army of steamrollers. It has been erased like a blackboard, rebuilt and erased again. But baseball has marked the time. This field, this game: it's a part of our past, Ray. It reminds of us of all that once was good and it could be again. Oh... People will come Ray. People will most definitely come.
Shoeless Joe Jackson: Ty Cobb wanted to play, but none of us could stand the son of a bitch when we were alive, so we told him to stick it.
Ray Kinsella: I know more about farming than you think I do.
Mark: Well then how could you plow under a major crop?
Ray Kinsella: What's a crop?
The Voice: If you build it, he will come.
Ray Kinsella: You lied to me.
Terence Mann: Well, you were kidnapping me at the time, you big jerk!
Ray Kinsella: But, you lied to me!
Terence Mann: You said your finger was a gun!
Buelah Gasnick: I experienced the 60s.
Annie Kinsella: No, I think you experienced two 50s and moved right on to the 70s.
Answer: It was actually his own voice (Kevin Costner) that sent him on the journey. At the end of the movie there's even the part where Ray is recalling the voices he heard and turned to Shoeless Joe Jackson and says, "It was you". At which point Joe Jackson turns around and says, "No Ray. It was you".