Nash: "Does our relationship warrant long-term commitment? I need some kind of proof, some kind of verifiable, empirical data."
Alicia: "I'm sorry, just give me a moment to redefine my girlish notions of romance. How big is the universe?"
Nash: "Infinite."
Alicia: "How do you know? "
Nash: "I know because all the data indicates it's infinite."

Alicia: "But it hasn't been proven yet."
Nash: " No."
Alicia: "You haven't seen it."
Nash: "No."
Alicia: " How do you know for sure?"
Nash: "I don't, I just believe it."
Alicia: "It's the same with love I guess." (A Beautiful Mind )