You're an honest and level-headed youngster. You're bound to go far. I'd like to teach you my secret technique known as the Iron Fist.

14 seconds sound clip from the Five Fingers of Death movie soundboard.

You can hear this line at 00:37:24 in the DVD version of the movie.

Quote context

[...]

- You're a guest in our house. You shouldn't be involved. It's our responsibility.

- Go fetch a doctor. Sir! Yes, sir.

- Sir. You wanted to see me?

- You know you're not supposed to get into brawls. Why did you break the rules?

- Sir, Chen Lang went too far this time. I couldn't take it.

- You're an honest and level-headed youngster. You're bound to go far. I'd like to teach you my secret technique known as the Iron Fist.

- Thank you, sir. (2)

- During the past year, I've given you all sorts of menial tasks. That's because I wanted to test your patience, and toughen you up physically. That's the first step in training for the Iron Fist.

- Thank you very much sir.

- You see, I'm not getting any younger, and in that incident earlier on today, I got quite badly hurt.

[...]