- Ma, all knowledge is useful.
- Oh, is that so?

6 seconds sound clip from the Dragon connection (1980) movie soundboard.

You can hear this line at 00:18:27 in the DVD version of the movie.

Quote context

[...]

- Job-hunting, Ma. I must do this. I must get a job.

- Just stay at home. There's lots of land here you could be taking care of.

- Ma, you know I won't be a farmer. That's why I went away, to study.

- This study nonsense. I say who needs this study?

- What's more, why did you have to go into the South? You could have been married now.

- Ma, all knowledge is useful.

- Oh, is that so?

- Well, your Uncle Chan only studied for one year. And now he has this really good job as an accountant.

- Ma, that's different. How can I explain this to you?

- Oh well, don't bother.

- Come on. Come here.

- Yes, Mistress.

- She looked after me well while you were away. Now that you're back, I'd like to see you two together.

[...]