I love this conversation between Alicia and Nash from the movie "A Beautiful Mind".

Alicia: 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}