It's what he calls a guilt complex.
4 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.
You can hear this line at 00:51:56 in the Blu-ray version of the movie.
Quote context
[...]
- That's the one. He's a psychologist, you know.
- Well, that's a debatable point.
- So now they do something they think is good to make up for it, see?
- It's what he calls a guilt complex.
- It's nothing to laugh about. It's pretty serious, he says.
- It's a lot of rubbish. Don't listen to him.
- Oh, he knows what he's talking about. He's been studying that stuff for a long time.
[...]