I think perhaps you're right, Susie.

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

You can hear this line at 01:22:49 in the Blu-ray version of the movie.

Quote context

[...]

- Well, it's hard to explain. You see, they're having, well, sort of a trial about him.

- You mean like for a murder?

- Oh, no, no. It isn't that kind of a trial.

- It's just because he says he's Santa Claus.

- But I've got a feeling he is Santa Claus, Mother.

- Some people don't believe that. That's why they're having this...

- But he's so kind and nice and jolly. He's not like anyone else. He must be Santa.

- I think perhaps you're right, Susie.

- Is Mr. Kringle sad now, Mother?

- I'm afraid he is.

- I'm sure he misses you and...

- Then I'm going to write him a letter right now and cheer him up.

- Hey, Lou! Come here. Hey, here's a new one.

[...]