He went and challenged The Lotus Chief, thinking he had perfected his kung fu, and ended up being beaten up by him.
9 seconds sound clip from the Clan of the White Lotus movie soundboard.
You can hear this line at 00:43:13 in the DVD version of the movie.
Quote context
[...]
- Where were you when I had the baby?
- Nai-Cheng was looking for you frantically.
- Let me tell you, it's like this.
- Oh my God. Do you realize how lucky you were, to able to come back with no injury?
- It proves my kung fu is good. But something bothers me. I can't get close to him.
- My God, you be careful, you are still alive!
- He was followed but he got away, he fooled them by disguising himself as a waiter!
- You'll never listen will you? I've told you before, your kung fu is not good enough.
[...]