I don't believe I can't beat Pai Mei's kung fu.

4 seconds sound clip from the Executioners From Shaolin (1977) movie soundboard.

You can hear this line at 01:03:19 in the DVD version of the movie.

Quote context

[...]

- Yes, I know. It troubles you.

- Seven more years have passed. And all these years, I've been in touch with my brothers. We've been fighting the Manchurians all along.

- But with Pai Mei alive, we can't make much progress at all.

- Yes, I know. Pai Mei's kung fu...

- These last years, I've practiced hard. I know all of his weak points.

- I don't believe I can't beat Pai Mei's kung fu.

- If only you'd learn some Crane style!

- Don't mention that! We've never learned each other's style. That's always the way we've done it.

- Please forgive me. I...

- Yes, I know. If you can, kill him. If you can't, then run. Is that right? Well, any other advice?

- Nothing.

[...]