You must believe in Mr. Kringle and keep right on doing it. You must have faith in him.

7 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 01:32:47 in the Blu-ray version of the movie.

Quote context

[...]

- I don't suppose you even want to talk to me.

- Something about a present...

- Yes, I know. I'm sorry, Susie. I tried my best, but...

- You couldn't get it because you're not Santa Claus. That's why. You're just a nice old man with whiskers, like my mother said, and I shouldn't have believed you.

- I was wrong when I told you that, Susie.

- You must believe in Mr. Kringle and keep right on doing it. You must have faith in him.

- But he didn't get me the... That doesn't make sense, Mommy.

- Faith is believing in things when common sense tells you not to. (2)

- I mean, just because things don't turn out the way you want them to the first time, you've still got to believe in people. I found that out.

- You mean it's like, if at first you don't succeed, try, try again.

- Yes.

- I thought so.

[...]